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632975281 = 13921812
BaseRepresentation
bin100101101110100…
…110111110110001
31122010001110211221
4211232212332301
52244020202111
6142450505041
721454125661
oct4556467661
91563043757
10632975281
112a5330774
12157b95181
13a11a2bb3
14600cc1a1
153a883371
hex25ba6fb1

632975281 has 9 divisors (see below), whose sum is σ = 641103723. Its totient is φ = 624949560.

The previous prime is 632975279. The next prime is 632975303. The reversal of 632975281 is 182579236.

The square root of 632975281 is 25159.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 6974881 + 626000400 = 2641^2 + 25020^2 .

It is not a de Polignac number, because 632975281 - 21 = 632975279 is a prime.

It is a super-2 number, since 2×6329752812 = 801315412714057922, which contains 22 as substring.

Its product of digits (181440) is a multiple of the sum of its prime divisors (320).

It is not an unprimeable number, because it can be changed into a prime (632975221) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3497011 + ... + 3497191.

It is an arithmetic number, because the mean of its divisors is an integer number (71233747).

Almost surely, 2632975281 is an apocalyptic number.

632975281 is the 25159-th square number.

632975281 is the 12580-th centered octagonal number.

It is an amenable number.

632975281 is a deficient number, since it is larger than the sum of its proper divisors (8128442).

632975281 is an frugal number, since it uses more digits than its factorization.

632975281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640 (or 320 counting only the distinct ones).

The product of its digits is 181440, while the sum is 43.

The cubic root of 632975281 is about 858.6092905091.

The spelling of 632975281 in words is "six hundred thirty-two million, nine hundred seventy-five thousand, two hundred eighty-one".

Divisors: 1 139 181 19321 25159 32761 3497101 4553779 632975281