79790778 has 16 divisors (see below), whose sum is σ = 177312960. Its totient is φ = 26596908.

The previous prime is 79790771. The next prime is 79790779. The reversal of 79790778 is 87709797.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 1477607 = 79790778 / (7 + 9 + 7 + 9 + 0 + 7 + 7 + 8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79790771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 738750 + ... + 738857.

It is an arithmetic number, because the mean of its divisors is an integer number (11082060).

Almost surely, 2^79790778 is an apocalyptic number.

79790778 is an abundant number, since it is smaller than the sum of its proper divisors (97522182).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

79790778 is a wasteful number, since it uses less digits than its factorization.

79790778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1477618 (or 1477612 counting only the distinct ones).

The product of its (nonzero) digits is 1555848, while the sum is 54.

The square root of 79790778 is about 8932.5683876475. The cubic root of 79790778 is about 430.5109807929.

The spelling of 79790778 in words is "seventy-nine million, seven hundred ninety thousand, seven hundred seventy-eight".