78126516 has 72 divisors (see below), whose sum is σ = 214995144. Its totient is φ = 23777280.

The previous prime is 78126487. The next prime is 78126539. The reversal of 78126516 is 61562187.

It can be written as a sum of positive squares in 4 ways, for example, as 6656400 + 71470116 = 2580^2 + 8454^2 .

It is a super-2 number, since 2×78126516² = 12207505004596512, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44536 + ... + 46256.

Almost surely, 2^78126516 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78126516, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107497572).

78126516 is an abundant number, since it is smaller than the sum of its proper divisors (136868628).

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

78126516 is a wasteful number, since it uses less digits than its factorization.

78126516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1841 (or 1836 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 78126516 is about 8838.9205223262. The cubic root of 78126516 is about 427.4967517964.

The spelling of 78126516 in words is "seventy-eight million, one hundred twenty-six thousand, five hundred sixteen".