97978489 has 6 divisors (see below), whose sum is σ = 113975034. Its totient is φ = 83981520.

The previous prime is 97978487. The next prime is 97978493. The reversal of 97978489 is 98487979.

It can be written as a sum of positive squares in only one way, i.e., 69973225 + 28005264 = 8365^2 + 5292^2 .

It is not a de Polignac number, because 97978489 - 2¹ = 97978487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (97978487) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 999732 + ... + 999829.

It is an arithmetic number, because the mean of its divisors is an integer number (18995839).

Almost surely, 2^97978489 is an apocalyptic number.

It is an amenable number.

97978489 is a deficient number, since it is larger than the sum of its proper divisors (15996545).

97978489 is a wasteful number, since it uses less digits than its factorization.

97978489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1999575 (or 1999568 counting only the distinct ones).

The product of its digits is 9144576, while the sum is 61.

The square root of 97978489 is about 9898.4084074158. The cubic root of 97978489 is about 461.0098937119.

The spelling of 97978489 in words is "ninety-seven million, nine hundred seventy-eight thousand, four hundred eighty-nine".