97978797 has 24 divisors (see below), whose sum is σ = 163185984. Its totient is φ = 55488384.

The previous prime is 97978759. The next prime is 97978819. The reversal of 97978797 is 79787979.

It is not a de Polignac number, because 97978797 - 2¹⁹ = 97454509 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 (97978717) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 238 + ... + 14000.

It is an arithmetic number, because the mean of its divisors is an integer number (6799416).

Almost surely, 2^97978797 is an apocalyptic number.

It is an amenable number.

97978797 is a deficient number, since it is larger than the sum of its proper divisors (65207187).

97978797 is a wasteful number, since it uses less digits than its factorization.

97978797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13889 (or 13886 counting only the distinct ones).

The product of its digits is 14002632, while the sum is 63.

The square root of 97978797 is about 9898.4239654604. The cubic root of 97978797 is about 461.0103767801.

The spelling of 97978797 in words is "ninety-seven million, nine hundred seventy-eight thousand, seven hundred ninety-seven".