641597770 has 64 divisors (see below), whose sum is σ = 1284304896. Its totient is φ = 228833280.

The previous prime is 641597767. The next prime is 641597771. The reversal of 641597770 is 77795146.

It is a self number, because there is not a number n which added to its sum of digits gives 641597770.

It is not an unprimeable number, because it can be changed into a prime (641597771) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1674999 + ... + 1675381.

It is an arithmetic number, because the mean of its divisors is an integer number (20067264).

Almost surely, 2^641597770 is an apocalyptic number.

641597770 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

641597770 is a wasteful number, since it uses less digits than its factorization.

641597770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655.

The product of its (nonzero) digits is 370440, while the sum is 46.

The square root of 641597770 is about 25329.7802990867. The cubic root of 641597770 is about 862.4904240343.

The spelling of 641597770 in words is "six hundred forty-one million, five hundred ninety-seven thousand, seven hundred seventy".