78919407 has 32 divisors (see below), whose sum is σ = 140659200. Its totient is φ = 42721344.

The previous prime is 78919387. The next prime is 78919429. The reversal of 78919407 is 70491987.

It is not a de Polignac number, because 78919407 - 2⁶ = 78919343 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78919447) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7398 + ... + 14579.

It is an arithmetic number, because the mean of its divisors is an integer number (4395600).

Almost surely, 2^78919407 is an apocalyptic number.

78919407 is a deficient number, since it is larger than the sum of its proper divisors (61739793).

78919407 is a wasteful number, since it uses less digits than its factorization.

78919407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22012 (or 22006 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 45.

The square root of 78919407 is about 8883.6595499828. The cubic root of 78919407 is about 428.9380809456.

The spelling of 78919407 in words is "seventy-eight million, nine hundred nineteen thousand, four hundred seven".