97978897 has 8 divisors (see below), whose sum is σ = 100390400. Its totient is φ = 95573520.

The previous prime is 97978891. The next prime is 97978931. The reversal of 97978897 is 79887979.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-97978897 is a prime.

It is a super-3 number, since 3×97978897³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (97978891) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62479 + ... + 64027.

It is an arithmetic number, because the mean of its divisors is an integer number (12548800).

Almost surely, 2^97978897 is an apocalyptic number.

It is an amenable number.

97978897 is a deficient number, since it is larger than the sum of its proper divisors (2411503).

97978897 is a wasteful number, since it uses less digits than its factorization.

97978897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3063.

The product of its digits is 16003008, while the sum is 64.

The square root of 97978897 is about 9898.4290167683. The cubic root of 97978897 is about 461.0105336203.

The spelling of 97978897 in words is "ninety-seven million, nine hundred seventy-eight thousand, eight hundred ninety-seven".