78811512 has 128 divisors (see below), whose sum is σ = 223110720. Its totient is φ = 23040000.

The previous prime is 78811493. The next prime is 78811519. The reversal of 78811512 is 21511887.

It is a super-2 number, since 2×78811512² = 12422508847452288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78811519) 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, 780262 + ... + 780362.

Almost surely, 2^78811512 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 78811512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111555360).

78811512 is an abundant number, since it is smaller than the sum of its proper divisors (144299208).

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

78811512 is a wasteful number, since it uses less digits than its factorization.

78811512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225 (or 221 counting only the distinct ones).

The product of its digits is 4480, while the sum is 33.

The square root of 78811512 is about 8877.5848066915. The cubic root of 78811512 is about 428.7425169612.

It can be divided in two parts, 78 and 811512, that multiplied together give a square (63297936 = 7956²).

The spelling of 78811512 in words is "seventy-eight million, eight hundred eleven thousand, five hundred twelve".