79878897 has 48 divisors (see below), whose sum is σ = 137479680. Its totient is φ = 43744896.

The previous prime is 79878889. The next prime is 79878901. The reversal of 79878897 is 79887897.

It is not a de Polignac number, because 79878897 - 2³ = 79878889 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79878857) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 156679 + ... + 157187.

It is an arithmetic number, because the mean of its divisors is an integer number (2864160).

Almost surely, 2^79878897 is an apocalyptic number.

It is an amenable number.

79878897 is a deficient number, since it is larger than the sum of its proper divisors (57600783).

79878897 is a wasteful number, since it uses less digits than its factorization.

79878897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 622 (or 619 counting only the distinct ones).

The product of its digits is 14224896, while the sum is 63.

The square root of 79878897 is about 8937.4994825175. The cubic root of 79878897 is about 430.6694044493.

The spelling of 79878897 in words is "seventy-nine million, eight hundred seventy-eight thousand, eight hundred ninety-seven".