77115428 has 24 divisors (see below), whose sum is σ = 145692288. Its totient is φ = 35503776.

The previous prime is 77115413. The next prime is 77115439. The reversal of 77115428 is 82451177.

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, 22475 + ... + 25677.

It is an arithmetic number, because the mean of its divisors is an integer number (6070512).

Almost surely, 2^77115428 is an apocalyptic number.

It is an amenable number.

77115428 is a deficient number, since it is larger than the sum of its proper divisors (68576860).

77115428 is a wasteful number, since it uses less digits than its factorization.

77115428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3683 (or 3681 counting only the distinct ones).

The product of its digits is 15680, while the sum is 35.

The square root of 77115428 is about 8781.5390450649. The cubic root of 77115428 is about 425.6445638155.

The spelling of 77115428 in words is "seventy-seven million, one hundred fifteen thousand, four hundred twenty-eight".