78638388 has 24 divisors (see below), whose sum is σ = 183886080. Its totient is φ = 26156160.

The previous prime is 78638387. The next prime is 78638423. The reversal of 78638388 is 88383687.

It is a self number, because there is not a number n which added to its sum of digits gives 78638388.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78638381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1093 + ... + 12588.

It is an arithmetic number, because the mean of its divisors is an integer number (7661920).

Almost surely, 2^78638388 is an apocalyptic number.

It is an amenable number.

78638388 is an abundant number, since it is smaller than the sum of its proper divisors (105247692).

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

78638388 is a wasteful number, since it uses less digits than its factorization.

78638388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14167 (or 14165 counting only the distinct ones).

The product of its digits is 1548288, while the sum is 51.

The square root of 78638388 is about 8867.8288210813. The cubic root of 78638388 is about 428.4283495080.

The spelling of 78638388 in words is "seventy-eight million, six hundred thirty-eight thousand, three hundred eighty-eight".