77771328 has 56 divisors (see below), whose sum is σ = 217883232. Its totient is φ = 24397824.

The previous prime is 77771327. The next prime is 77771339. The reversal of 77771328 is 82317777.

It is a self number, because there is not a number n which added to its sum of digits gives 77771328.

It is not an unprimeable number, because it can be changed into a prime (77771321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8650 + ... + 15177.

It is an arithmetic number, because the mean of its divisors is an integer number (3890772).

Almost surely, 2^77771328 is an apocalyptic number.

It is an amenable number.

77771328 is an abundant number, since it is smaller than the sum of its proper divisors (140111904).

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

77771328 is a wasteful number, since it uses less digits than its factorization.

77771328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23859 (or 23849 counting only the distinct ones).

The product of its digits is 115248, while the sum is 42.

The square root of 77771328 is about 8818.8053612720. The cubic root of 77771328 is about 426.8479221206.

The spelling of 77771328 in words is "seventy-seven million, seven hundred seventy-one thousand, three hundred twenty-eight".