77964788690 has 32 divisors (see below), whose sum is σ = 143046313200. Its totient is φ = 30586694400.

The previous prime is 77964788653. The next prime is 77964788813. The reversal of 77964788690 is 9688746977.

It can be written as a sum of positive squares in 8 ways, for example, as 48121880689 + 29842908001 = 219367^2 + 172751^2 .

It is a super-2 number, since 2×77964788690² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29780 + ... + 396000.

Almost surely, 2^77964788690 is an apocalyptic number.

77964788690 is a deficient number, since it is larger than the sum of its proper divisors (65081524510).

77964788690 is a wasteful number, since it uses less digits than its factorization.

77964788690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366638.

The product of its (nonzero) digits is 256048128, while the sum is 71.

The spelling of 77964788690 in words is "seventy-seven billion, nine hundred sixty-four million, seven hundred eighty-eight thousand, six hundred ninety".