641697956 has 24 divisors (see below), whose sum is σ = 1177873536. Its totient is φ = 305532000.

The previous prime is 641697949. The next prime is 641698103. The reversal of 641697956 is 659796146.

It is a junction number, because it is equal to n+sod(n) for n = 641697898 and 641697907.

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, 39170 + ... + 53081.

It is an arithmetic number, because the mean of its divisors is an integer number (49078064).

Almost surely, 2^641697956 is an apocalyptic number.

It is an amenable number.

641697956 is a deficient number, since it is larger than the sum of its proper divisors (536175580).

641697956 is a wasteful number, since it uses less digits than its factorization.

641697956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92339 (or 92337 counting only the distinct ones).

The product of its digits is 2449440, while the sum is 53.

The square root of 641697956 is about 25331.7578545193. The cubic root of 641697956 is about 862.5353145521.

The spelling of 641697956 in words is "six hundred forty-one million, six hundred ninety-seven thousand, nine hundred fifty-six".