45281720 has 32 divisors (see below), whose sum is σ = 111147120. Its totient is φ = 16465920.

The previous prime is 45281713. The next prime is 45281737. The reversal of 45281720 is 2718254.

It is a super-3 number, since 3×45281720³ (a number of 24 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51017 + ... + 51896.

Almost surely, 2^45281720 is an apocalyptic number.

45281720 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

45281720 is an abundant number, since it is smaller than the sum of its proper divisors (65865400).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

45281720 is a wasteful number, since it uses less digits than its factorization.

45281720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102935 (or 102931 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 45281720 is about 6729.1693395248. The cubic root of 45281720 is about 356.4300446237.

Adding to 45281720 its reverse (2718254), we get a palindrome (47999974).

The spelling of 45281720 in words is "forty-five million, two hundred eighty-one thousand, seven hundred twenty".