77865144 has 32 divisors (see below), whose sum is σ = 222472320. Its totient is φ = 22247136.

The previous prime is 77865127. The next prime is 77865157. The reversal of 77865144 is 44156877.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 77865096 and 77865105.

It is a congruent number.

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, 231574 + ... + 231909.

It is an arithmetic number, because the mean of its divisors is an integer number (6952260).

Almost surely, 2^77865144 is an apocalyptic number.

It is an amenable number.

77865144 is an abundant number, since it is smaller than the sum of its proper divisors (144607176).

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

77865144 is a wasteful number, since it uses less digits than its factorization.

77865144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463499 (or 463495 counting only the distinct ones).

The product of its digits is 188160, while the sum is 42.

The square root of 77865144 is about 8824.1228459264. The cubic root of 77865144 is about 427.0194895188.

The spelling of 77865144 in words is "seventy-seven million, eight hundred sixty-five thousand, one hundred forty-four".