78238315 has 12 divisors (see below), whose sum is σ = 96050016. Its totient is φ = 61152768.

The previous prime is 78238297. The next prime is 78238319. The reversal of 78238315 is 51383287.

It is not a de Polignac number, because 78238315 - 2⁵ = 78238283 is a prime.

It is a super-2 number, since 2×78238315² = 12242467868078450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78238319) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 135307 + ... + 135883.

It is an arithmetic number, because the mean of its divisors is an integer number (8004168).

Almost surely, 2^78238315 is an apocalyptic number.

78238315 is a deficient number, since it is larger than the sum of its proper divisors (17811701).

78238315 is an frugal number, since it uses more digits than its factorization.

78238315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1206 (or 629 counting only the distinct ones).

The product of its digits is 40320, while the sum is 37.

The square root of 78238315 is about 8845.2425065681. The cubic root of 78238315 is about 427.7005704754.

The spelling of 78238315 in words is "seventy-eight million, two hundred thirty-eight thousand, three hundred fifteen".