77993975 has 6 divisors (see below), whose sum is σ = 96712560. Its totient is φ = 62395160.

The previous prime is 77993957. The next prime is 77994017. The reversal of 77993975 is 57939977.

It is not a de Polignac number, because 77993975 - 2⁶ = 77993911 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77993975.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1559855 + ... + 1559904.

It is an arithmetic number, because the mean of its divisors is an integer number (16118760).

Almost surely, 2^77993975 is an apocalyptic number.

77993975 is a deficient number, since it is larger than the sum of its proper divisors (18718585).

77993975 is a wasteful number, since it uses less digits than its factorization.

77993975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3119769 (or 3119764 counting only the distinct ones).

The product of its digits is 3750705, while the sum is 56.

The square root of 77993975 is about 8831.4197612841. The cubic root of 77993975 is about 427.2548667034.

The spelling of 77993975 in words is "seventy-seven million, nine hundred ninety-three thousand, nine hundred seventy-five".