77080428 has 18 divisors (see below), whose sum is σ = 194842284. Its totient is φ = 25693464.

The previous prime is 77080411. The next prime is 77080433. The reversal of 77080428 is 82408077.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 2141123 = 77080428 / (7 + 7 + 0 + 8 + 0 + 4 + 2 + 8).

It is a junction number, because it is equal to n+sod(n) for n = 77080392 and 77080401.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1070526 + ... + 1070597.

Almost surely, 2^77080428 is an apocalyptic number.

It is an amenable number.

77080428 is an abundant number, since it is smaller than the sum of its proper divisors (117761856).

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

77080428 is a wasteful number, since it uses less digits than its factorization.

77080428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2141133 (or 2141128 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 36.

The square root of 77080428 is about 8779.5460019297. The cubic root of 77080428 is about 425.5801590026.

The spelling of 77080428 in words is "seventy-seven million, eighty thousand, four hundred twenty-eight".