78644670 has 32 divisors (see below), whose sum is σ = 203267232. Its totient is φ = 19358592.

The previous prime is 78644663. The next prime is 78644711. The reversal of 78644670 is 7644687.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100437 + ... + 101216.

It is an arithmetic number, because the mean of its divisors is an integer number (6352101).

Almost surely, 2^78644670 is an apocalyptic number.

78644670 is an abundant number, since it is smaller than the sum of its proper divisors (124622562).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78644670 is a wasteful number, since it uses less digits than its factorization.

78644670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201676.

The product of its (nonzero) digits is 225792, while the sum is 42.

The square root of 78644670 is about 8868.1830157028. The cubic root of 78644670 is about 428.4397574870.

The spelling of 78644670 in words is "seventy-eight million, six hundred forty-four thousand, six hundred seventy".