78137238 has 16 divisors (see below), whose sum is σ = 156545136. Its totient is φ = 26000640.

The previous prime is 78137231. The next prime is 78137243. The reversal of 78137238 is 83273187.

It is a super-3 number, since 3×78137238³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 78137196 and 78137205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78137231) 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, 7423 + ... + 14538.

It is an arithmetic number, because the mean of its divisors is an integer number (9784071).

Almost surely, 2^78137238 is an apocalyptic number.

78137238 is an abundant number, since it is smaller than the sum of its proper divisors (78407898).

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

78137238 is a wasteful number, since it uses less digits than its factorization.

78137238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22559.

The product of its digits is 56448, while the sum is 39.

The square root of 78137238 is about 8839.5270235460. The cubic root of 78137238 is about 427.5163073017.

It can be divided in two parts, 7813 and 7238, that added together give a palindrome (15051).

The spelling of 78137238 in words is "seventy-eight million, one hundred thirty-seven thousand, two hundred thirty-eight".