78536397 has 4 divisors (see below), whose sum is σ = 104715200. Its totient is φ = 52357596.

The previous prime is 78536387. The next prime is 78536401. The reversal of 78536397 is 79363587.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 78536397 - 2⁶ = 78536333 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 (78536317) 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, 13089397 + ... + 13089402.

It is an arithmetic number, because the mean of its divisors is an integer number (26178800).

Almost surely, 2^78536397 is an apocalyptic number.

It is an amenable number.

78536397 is a deficient number, since it is larger than the sum of its proper divisors (26178803).

78536397 is a wasteful number, since it uses less digits than its factorization.

78536397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26178802.

The product of its digits is 952560, while the sum is 48.

The square root of 78536397 is about 8862.0763368412. The cubic root of 78536397 is about 428.2430509486.

The spelling of 78536397 in words is "seventy-eight million, five hundred thirty-six thousand, three hundred ninety-seven".