78638608 has 10 divisors (see below), whose sum is σ = 152362334. Its totient is φ = 39319296.

The previous prime is 78638569. The next prime is 78638611. The reversal of 78638608 is 80683687.

It can be written as a sum of positive squares in only one way, i.e., 75134224 + 3504384 = 8668^2 + 1872^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2457441 + ... + 2457472.

Almost surely, 2^78638608 is an apocalyptic number.

It is an amenable number.

78638608 is a deficient number, since it is larger than the sum of its proper divisors (73723726).

78638608 is a wasteful number, since it uses less digits than its factorization.

78638608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4914921 (or 4914915 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 46.

The square root of 78638608 is about 8867.8412254618. The cubic root of 78638608 is about 428.4287490337.

It can be divided in two parts, 7863 and 8608, that added together give a triangular number (16471 = T₁₈₁).

The spelling of 78638608 in words is "seventy-eight million, six hundred thirty-eight thousand, six hundred eight".