78975997 has 8 divisors (see below), whose sum is σ = 82578240. Its totient is φ = 75530620.

The previous prime is 78975983. The next prime is 78976013. The reversal of 78975997 is 79957987.

It is not a de Polignac number, because 78975997 - 2¹¹ = 78973949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78975937) 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, 8922 + ... + 15412.

It is an arithmetic number, because the mean of its divisors is an integer number (10322280).

Almost surely, 2^78975997 is an apocalyptic number.

It is an amenable number.

78975997 is a deficient number, since it is larger than the sum of its proper divisors (3602243).

78975997 is an frugal number, since it uses more digits than its factorization.

78975997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6560 (or 6514 counting only the distinct ones).

The product of its digits is 10001880, while the sum is 61.

The square root of 78975997 is about 8886.8440404904. The cubic root of 78975997 is about 429.0405813205.

The spelling of 78975997 in words is "seventy-eight million, nine hundred seventy-five thousand, nine hundred ninety-seven".