78978513 has 16 divisors (see below), whose sum is σ = 109327680. Its totient is φ = 50654016.

The previous prime is 78978509. The next prime is 78978541. The reversal of 78978513 is 31587987.

It is not a de Polignac number, because 78978513 - 2² = 78978509 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78978503) 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, 25231 + ... + 28187.

It is an arithmetic number, because the mean of its divisors is an integer number (6832980).

Almost surely, 2^78978513 is an apocalyptic number.

It is an amenable number.

78978513 is a deficient number, since it is larger than the sum of its proper divisors (30349167).

78978513 is a wasteful number, since it uses less digits than its factorization.

78978513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3296.

The product of its digits is 423360, while the sum is 48.

The square root of 78978513 is about 8886.9855969277. The cubic root of 78978513 is about 429.0451373658.

The spelling of 78978513 in words is "seventy-eight million, nine hundred seventy-eight thousand, five hundred thirteen".