671787252 has 36 divisors (see below), whose sum is σ = 1701124516. Its totient is φ = 223534080.

The previous prime is 671787229. The next prime is 671787253. The reversal of 671787252 is 252787176.

It can be written as a sum of positive squares in 2 ways, for example, as 415915236 + 255872016 = 20394^2 + 15996^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×671787252² = 902596223899423008, which contains 22 as substring.

671787252 is a Rhonda number in base 10.

Its product of digits (329280) is a multiple of the sum of its prime factors (32928).

It is a junction number, because it is equal to n+sod(n) for n = 671787198 and 671787207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671787253) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4602 + ... + 36942.

Almost surely, 2^671787252 is an apocalyptic number.

It is an amenable number.

671787252 is an abundant number, since it is smaller than the sum of its proper divisors (1029337264).

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

671787252 is a wasteful number, since it uses less digits than its factorization.

671787252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32928 (or 32923 counting only the distinct ones).

The product of its digits is 329280, while the sum is 45.

The square root of 671787252 is about 25918.8590026644. The cubic root of 671787252 is about 875.8113842989.

The spelling of 671787252 in words is "six hundred seventy-one million, seven hundred eighty-seven thousand, two hundred fifty-two".