78358638 has 64 divisors (see below), whose sum is σ = 170496000. Its totient is φ = 23950080.

The previous prime is 78358633. The next prime is 78358681. The reversal of 78358638 is 83685387.

It is a happy number.

It is a super-2 number, since 2×78358638² = 12280152298430088, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78358633) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 393663 + ... + 393861.

It is an arithmetic number, because the mean of its divisors is an integer number (2664000).

Almost surely, 2^78358638 is an apocalyptic number.

78358638 is an abundant number, since it is smaller than the sum of its proper divisors (92137362).

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

78358638 is a wasteful number, since it uses less digits than its factorization.

78358638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337.

The product of its digits is 967680, while the sum is 48.

The square root of 78358638 is about 8852.0414594601. The cubic root of 78358638 is about 427.9197122815.

The spelling of 78358638 in words is "seventy-eight million, three hundred fifty-eight thousand, six hundred thirty-eight".