641922356 has 6 divisors (see below), whose sum is σ = 1123364130. Its totient is φ = 320961176.

The previous prime is 641922343. The next prime is 641922371. The reversal of 641922356 is 653229146.

It can be written as a sum of positive squares in only one way, i.e., 405377956 + 236544400 = 20134^2 + 15380^2 .

It is a super-2 number, since 2×641922356² = 824128622265181472, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80240291 + ... + 80240298.

It is an arithmetic number, because the mean of its divisors is an integer number (187227355).

Almost surely, 2^641922356 is an apocalyptic number.

It is an amenable number.

641922356 is a deficient number, since it is larger than the sum of its proper divisors (481441774).

641922356 is a wasteful number, since it uses less digits than its factorization.

641922356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160480593 (or 160480591 counting only the distinct ones).

The product of its digits is 77760, while the sum is 38.

The square root of 641922356 is about 25336.1866901868. The cubic root of 641922356 is about 862.6358449057.

The spelling of 641922356 in words is "six hundred forty-one million, nine hundred twenty-two thousand, three hundred fifty-six".