79778697 has 16 divisors (see below), whose sum is σ = 114000000. Its totient is φ = 49496832.

The previous prime is 79778641. The next prime is 79778723. The reversal of 79778697 is 79687797.

It is not a de Polignac number, because 79778697 - 2¹² = 79774601 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 79778697.

It is not an unprimeable number, because it can be changed into a prime (79778597) 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 15 ways as a sum of consecutive naturals, for example, 13072 + ... + 18177.

It is an arithmetic number, because the mean of its divisors is an integer number (7125000).

Almost surely, 2^79778697 is an apocalyptic number.

It is an amenable number.

79778697 is a deficient number, since it is larger than the sum of its proper divisors (34221303).

79778697 is a wasteful number, since it uses less digits than its factorization.

79778697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31312.

The product of its digits is 9335088, while the sum is 60.

The square root of 79778697 is about 8931.8921287709. The cubic root of 79778697 is about 430.4892520259.

The spelling of 79778697 in words is "seventy-nine million, seven hundred seventy-eight thousand, six hundred ninety-seven".