78956779 has 16 divisors (see below), whose sum is σ = 88865280. Its totient is φ = 69521760.

The previous prime is 78956777. The next prime is 78956791. The reversal of 78956779 is 97765987.

It is not a de Polignac number, because 78956779 - 2¹ = 78956777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78956777) 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, 170302 + ... + 170764.

It is an arithmetic number, because the mean of its divisors is an integer number (5554080).

Almost surely, 2^78956779 is an apocalyptic number.

78956779 is a deficient number, since it is larger than the sum of its proper divisors (9908501).

78956779 is a wasteful number, since it uses less digits than its factorization.

78956779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 930.

The product of its digits is 6667920, while the sum is 58.

The square root of 78956779 is about 8885.7627134647. The cubic root of 78956779 is about 429.0057776203.

The spelling of 78956779 in words is "seventy-eight million, nine hundred fifty-six thousand, seven hundred seventy-nine".