77680808690 has 16 divisors (see below), whose sum is σ = 139831819992. Its totient is φ = 31070909184.

The previous prime is 77680808683. The next prime is 77680808701. The reversal of 77680808690 is 9680808677.

It can be written as a sum of positive squares in 4 ways, for example, as 54834183889 + 22846624801 = 234167^2 + 151151^2 .

It is a super-2 number, since 2×77680808690² (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 7 ways as a sum of consecutive naturals, for example, 70352 + ... + 400388.

Almost surely, 2^77680808690 is an apocalyptic number.

77680808690 is a deficient number, since it is larger than the sum of its proper divisors (62151011302).

77680808690 is a wasteful number, since it uses less digits than its factorization.

77680808690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353581.

The product of its (nonzero) digits is 8128512, while the sum is 59.

The spelling of 77680808690 in words is "seventy-seven billion, six hundred eighty million, eight hundred eight thousand, six hundred ninety".