77728108 has 12 divisors (see below), whose sum is σ = 136555272. Its totient is φ = 38712320.

The previous prime is 77728073. The next prime is 77728111. The reversal of 77728108 is 80182777.

It is a happy number.

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, 36778 + ... + 38833.

It is an arithmetic number, because the mean of its divisors is an integer number (11379606).

Almost surely, 2^77728108 is an apocalyptic number.

It is an amenable number.

77728108 is a deficient number, since it is larger than the sum of its proper divisors (58827164).

77728108 is a wasteful number, since it uses less digits than its factorization.

77728108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75872 (or 75870 counting only the distinct ones).

The product of its (nonzero) digits is 43904, while the sum is 40.

The square root of 77728108 is about 8816.3545754467. The cubic root of 77728108 is about 426.7688364808.

The spelling of 77728108 in words is "seventy-seven million, seven hundred twenty-eight thousand, one hundred eight".