78964657 has 4 divisors (see below), whose sum is σ = 81511936. Its totient is φ = 76417380.

The previous prime is 78964621. The next prime is 78964661. The reversal of 78964657 is 75646987.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 75646987 = 13 ⋅5818999.

It is a cyclic number.

It is not a de Polignac number, because 78964657 - 2¹⁵ = 78931889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78964607) 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, 1273593 + ... + 1273654.

It is an arithmetic number, because the mean of its divisors is an integer number (20377984).

Almost surely, 2^78964657 is an apocalyptic number.

It is an amenable number.

78964657 is a deficient number, since it is larger than the sum of its proper divisors (2547279).

78964657 is a wasteful number, since it uses less digits than its factorization.

78964657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2547278.

The product of its digits is 2540160, while the sum is 52.

The square root of 78964657 is about 8886.2059958117. The cubic root of 78964657 is about 429.0200453212.

The spelling of 78964657 in words is "seventy-eight million, nine hundred sixty-four thousand, six hundred fifty-seven".