78049791 has 16 divisors (see below), whose sum is σ = 115795200. Its totient is φ = 51958584.

The previous prime is 78049757. The next prime is 78049801. The reversal of 78049791 is 19794087.

78049791 is a `hidden beast` number, since 78 + 0 + 497 + 91 = 666.

It is not a de Polignac number, because 78049791 - 2¹⁰ = 78048767 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78047791) 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, 22320 + ... + 25578.

It is an arithmetic number, because the mean of its divisors is an integer number (7237200).

Almost surely, 2^78049791 is an apocalyptic number.

78049791 is a deficient number, since it is larger than the sum of its proper divisors (37745409).

78049791 is a wasteful number, since it uses less digits than its factorization.

78049791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4155 (or 4149 counting only the distinct ones).

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

The square root of 78049791 is about 8834.5792769096. The cubic root of 78049791 is about 427.3567633395.

The spelling of 78049791 in words is "seventy-eight million, forty-nine thousand, seven hundred ninety-one".