78666624 has 96 divisors (see below), whose sum is σ = 236293200. Its totient is φ = 25073664.

The previous prime is 78666619. The next prime is 78666661. The reversal of 78666624 is 42666687.

It is a tau number, because it is divible by the number of its divisors (96).

It is a self number, because there is not a number n which added to its sum of digits gives 78666624.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25012 + ... + 27980.

Almost surely, 2^78666624 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78666624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (118146600).

78666624 is an abundant number, since it is smaller than the sum of its proper divisors (157626576).

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

78666624 is a wasteful number, since it uses less digits than its factorization.

78666624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3012 (or 2997 counting only the distinct ones).

The product of its digits is 580608, while the sum is 45.

The square root of 78666624 is about 8869.4207251658. The cubic root of 78666624 is about 428.4796207154.

The spelling of 78666624 in words is "seventy-eight million, six hundred sixty-six thousand, six hundred twenty-four".