78604665 has 16 divisors (see below), whose sum is σ = 126218688. Its totient is φ = 41772096.

The previous prime is 78604663. The next prime is 78604693. The reversal of 78604665 is 56640687.

It is a happy number.

It is not a de Polignac number, because 78604665 - 2¹ = 78604663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78604663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5014 + ... + 13503.

It is an arithmetic number, because the mean of its divisors is an integer number (7888668).

Almost surely, 2^78604665 is an apocalyptic number.

It is an amenable number.

78604665 is a deficient number, since it is larger than the sum of its proper divisors (47614023).

78604665 is a wasteful number, since it uses less digits than its factorization.

78604665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18808.

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

The square root of 78604665 is about 8865.9271934750. The cubic root of 78604665 is about 428.3670988672.

The spelling of 78604665 in words is "seventy-eight million, six hundred four thousand, six hundred sixty-five".