78649884 has 36 divisors (see below), whose sum is σ = 199268160. Its totient is φ = 26156160.

The previous prime is 78649877. The next prime is 78649897. The reversal of 78649884 is 48894687.

78649884 is a `hidden beast` number, since 78 + 6 + 498 + 84 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a self number, because there is not a number n which added to its sum of digits gives 78649884.

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, 14964 + ... + 19524.

Almost surely, 2^78649884 is an apocalyptic number.

It is an amenable number.

78649884 is an abundant number, since it is smaller than the sum of its proper divisors (120618276).

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

78649884 is a wasteful number, since it uses less digits than its factorization.

78649884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5050 (or 5045 counting only the distinct ones).

The product of its digits is 3096576, while the sum is 54.

The square root of 78649884 is about 8868.4769831127. The cubic root of 78649884 is about 428.4492255392.

The spelling of 78649884 in words is "seventy-eight million, six hundred forty-nine thousand, eight hundred eighty-four".