641570892 has 24 divisors (see below), whose sum is σ = 1497409200. Its totient is φ = 213798336.

The previous prime is 641570873. The next prime is 641570893. The reversal of 641570892 is 298075146.

It is a super-2 number, since 2×641570892² = 823226418923351328, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (641570893) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78034 + ... + 85862.

It is an arithmetic number, because the mean of its divisors is an integer number (62392050).

Almost surely, 2^641570892 is an apocalyptic number.

It is an amenable number.

641570892 is an abundant number, since it is smaller than the sum of its proper divisors (855838308).

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

641570892 is a wasteful number, since it uses less digits than its factorization.

641570892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14665 (or 14663 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 641570892 is about 25329.2497322759. The cubic root of 641570892 is about 862.4783799664.

The spelling of 641570892 in words is "six hundred forty-one million, five hundred seventy thousand, eight hundred ninety-two".