77022640 has 20 divisors (see below), whose sum is σ = 179077824. Its totient is φ = 30809024.

The previous prime is 77022623. The next prime is 77022661. The reversal of 77022640 is 4622077.

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 77022599 and 77022608.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 481312 + ... + 481471.

Almost surely, 2^77022640 is an apocalyptic number.

It is an amenable number.

77022640 is an abundant number, since it is smaller than the sum of its proper divisors (102055184).

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

77022640 is a wasteful number, since it uses less digits than its factorization.

77022640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 962796 (or 962790 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 28.

The square root of 77022640 is about 8776.2543263057. The cubic root of 77022640 is about 425.4737784535.

The spelling of 77022640 in words is "seventy-seven million, twenty-two thousand, six hundred forty".