77922986520 has 64 divisors (see below), whose sum is σ = 233787316320. Its totient is φ = 20777831424.

The previous prime is 77922986509. The next prime is 77922986567. The reversal of 77922986520 is 2568922977.

It is a happy number.

It is a super-2 number, since 2×77922986520² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2950494 + ... + 2976786.

Almost surely, 2^77922986520 is an apocalyptic number.

It is an amenable number.

77922986520 is an abundant number, since it is smaller than the sum of its proper divisors (155864329800).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77922986520 is a wasteful number, since it uses less digits than its factorization.

77922986520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51004 (or 51000 counting only the distinct ones).

The product of its (nonzero) digits is 7620480, while the sum is 57.

The spelling of 77922986520 in words is "seventy-seven billion, nine hundred twenty-two million, nine hundred eighty-six thousand, five hundred twenty".