77993917 has 16 divisors (see below), whose sum is σ = 83966400. Its totient is φ = 72230400.

The previous prime is 77993911. The next prime is 77993921. The reversal of 77993917 is 71939977.

It is a de Polignac number, because none of the positive numbers 2^k-77993917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77993911) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 185934 + ... + 186352.

It is an arithmetic number, because the mean of its divisors is an integer number (5247900).

Almost surely, 2^77993917 is an apocalyptic number.

It is an amenable number.

77993917 is a deficient number, since it is larger than the sum of its proper divisors (5972483).

77993917 is a wasteful number, since it uses less digits than its factorization.

77993917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636.

The product of its digits is 750141, while the sum is 52.

The square root of 77993917 is about 8831.4164775533. The cubic root of 77993917 is about 427.2547607944.

The spelling of 77993917 in words is "seventy-seven million, nine hundred ninety-three thousand, nine hundred seventeen".