78956813 has 8 divisors (see below), whose sum is σ = 85857408. Its totient is φ = 72174384.

The previous prime is 78956807. The next prime is 78956831. The reversal of 78956813 is 31865987.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78956813 - 2⁴ = 78956797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78956863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28145 + ... + 30822.

It is an arithmetic number, because the mean of its divisors is an integer number (10732176).

Almost surely, 2^78956813 is an apocalyptic number.

It is an amenable number.

78956813 is a deficient number, since it is larger than the sum of its proper divisors (6900595).

78956813 is a wasteful number, since it uses less digits than its factorization.

78956813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59083.

The product of its digits is 362880, while the sum is 47.

The square root of 78956813 is about 8885.7646266374. The cubic root of 78956813 is about 429.0058391991.

The spelling of 78956813 in words is "seventy-eight million, nine hundred fifty-six thousand, eight hundred thirteen".