78933987 has 48 divisors (see below), whose sum is σ = 132212640. Its totient is φ = 46474560.

The previous prime is 78933971. The next prime is 78933991.

78933987 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 78933987 - 2⁴ = 78933971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78933937) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 120553 + ... + 121205.

It is an arithmetic number, because the mean of its divisors is an integer number (2754430).

Almost surely, 2^78933987 is an apocalyptic number.

78933987 is a deficient number, since it is larger than the sum of its proper divisors (53278653).

78933987 is a wasteful number, since it uses less digits than its factorization.

78933987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721 (or 704 counting only the distinct ones).

The product of its digits is 2286144, while the sum is 54.

The square root of 78933987 is about 8884.4801198494. The cubic root of 78933987 is about 428.9644941029.

The spelling of 78933987 in words is "seventy-eight million, nine hundred thirty-three thousand, nine hundred eighty-seven".