77979552 has 48 divisors (see below), whose sum is σ = 233940672. Its totient is φ = 22279680.

The previous prime is 77979547. The next prime is 77979563. The reversal of 77979552 is 25597977.

It is a tau number, because it is divible by the number of its divisors (48).

It is a junction number, because it is equal to n+sod(n) for n = 77979495 and 77979504.

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, 57349 + ... + 58692.

It is an arithmetic number, because the mean of its divisors is an integer number (4873764).

Almost surely, 2^77979552 is an apocalyptic number.

It is an amenable number.

77979552 is an abundant number, since it is smaller than the sum of its proper divisors (155961120).

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

77979552 is a wasteful number, since it uses less digits than its factorization.

77979552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116061 (or 116053 counting only the distinct ones).

The product of its digits is 1389150, while the sum is 51.

The square root of 77979552 is about 8830.6031504082. The cubic root of 77979552 is about 427.2285284431.

The spelling of 77979552 in words is "seventy-seven million, nine hundred seventy-nine thousand, five hundred fifty-two".