77823864 has 48 divisors (see below), whose sum is σ = 211723200. Its totient is φ = 25824384.

The previous prime is 77823847. The next prime is 77823899. The reversal of 77823864 is 46832877.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14457 + ... + 19095.

It is an arithmetic number, because the mean of its divisors is an integer number (4410900).

Almost surely, 2^77823864 is an apocalyptic number.

It is an amenable number.

77823864 is an abundant number, since it is smaller than the sum of its proper divisors (133899336).

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

77823864 is a wasteful number, since it uses less digits than its factorization.

77823864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4884 (or 4877 counting only the distinct ones).

The product of its digits is 451584, while the sum is 45.

The square root of 77823864 is about 8821.7834931492. The cubic root of 77823864 is about 426.9440150957.

It can be divided in two parts, 77823 and 864, that added together give a palindrome (78687).

The spelling of 77823864 in words is "seventy-seven million, eight hundred twenty-three thousand, eight hundred sixty-four".