78597971 has 4 divisors (see below), whose sum is σ = 79930200. Its totient is φ = 77265744.

The previous prime is 78597913. The next prime is 78597997. The reversal of 78597971 is 17979587.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78597971 - 2⁶ = 78597907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78591971) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 666026 + ... + 666143.

It is an arithmetic number, because the mean of its divisors is an integer number (19982550).

Almost surely, 2^78597971 is an apocalyptic number.

78597971 is a deficient number, since it is larger than the sum of its proper divisors (1332229).

78597971 is a wasteful number, since it uses less digits than its factorization.

78597971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1332228.

The product of its digits is 1111320, while the sum is 53.

The square root of 78597971 is about 8865.5496727501. The cubic root of 78597971 is about 428.3549385594.

The spelling of 78597971 in words is "seventy-eight million, five hundred ninety-seven thousand, nine hundred seventy-one".