78064665 has 64 divisors (see below), whose sum is σ = 152616960. Its totient is φ = 33304320.

The previous prime is 78064633. The next prime is 78064681. The reversal of 78064665 is 56646087.

It is a happy number.

It is not a de Polignac number, because 78064665 - 2⁵ = 78064633 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 93982 + ... + 94808.

It is an arithmetic number, because the mean of its divisors is an integer number (2384640).

Almost surely, 2^78064665 is an apocalyptic number.

It is an amenable number.

78064665 is a deficient number, since it is larger than the sum of its proper divisors (74552295).

78064665 is a wasteful number, since it uses less digits than its factorization.

78064665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 902.

The product of its (nonzero) digits is 241920, while the sum is 42.

The square root of 78064665 is about 8835.4210425989. The cubic root of 78064665 is about 427.3839088351.

The spelling of 78064665 in words is "seventy-eight million, sixty-four thousand, six hundred sixty-five".