78638134 has 8 divisors (see below), whose sum is σ = 121762368. Its totient is φ = 38050680.

The previous prime is 78638117. The next prime is 78638143. The reversal of 78638134 is 43183687.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×78638134² = 12367912238003912, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 634117 + ... + 634240.

It is an arithmetic number, because the mean of its divisors is an integer number (15220296).

Almost surely, 2^78638134 is an apocalyptic number.

78638134 is a deficient number, since it is larger than the sum of its proper divisors (43124234).

78638134 is a wasteful number, since it uses less digits than its factorization.

78638134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1268390.

The product of its digits is 96768, while the sum is 40.

The square root of 78638134 is about 8867.8144996386. The cubic root of 78638134 is about 428.4278882366.

The spelling of 78638134 in words is "seventy-eight million, six hundred thirty-eight thousand, one hundred thirty-four".