641701956 has 24 divisors (see below), whose sum is σ = 1711205440. Its totient is φ = 183343392.

The previous prime is 641701939. The next prime is 641701961. The reversal of 641701956 is 659107146.

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, 3819571 + ... + 3819738.

Almost surely, 2^641701956 is an apocalyptic number.

It is an amenable number.

641701956 is an abundant number, since it is smaller than the sum of its proper divisors (1069503484).

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

641701956 is a wasteful number, since it uses less digits than its factorization.

641701956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7639323 (or 7639321 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 39.

The square root of 641701956 is about 25331.8368066747. The cubic root of 641701956 is about 862.5371067421.

The spelling of 641701956 in words is "six hundred forty-one million, seven hundred one thousand, nine hundred fifty-six".