78811140 has 48 divisors (see below), whose sum is σ = 221473728. Its totient is φ = 20939904.

The previous prime is 78811129. The next prime is 78811163. The reversal of 78811140 is 4111887.

It is a super-2 number, since 2×78811140² = 12422391576199200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 78811098 and 78811107.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15339 + ... + 19821.

It is an arithmetic number, because the mean of its divisors is an integer number (4614036).

Almost surely, 2^78811140 is an apocalyptic number.

It is an amenable number.

78811140 is an abundant number, since it is smaller than the sum of its proper divisors (142662588).

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

78811140 is a wasteful number, since it uses less digits than its factorization.

78811140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4788 (or 4786 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 30.

The square root of 78811140 is about 8877.5638550224. The cubic root of 78811140 is about 428.7418423877.

The spelling of 78811140 in words is "seventy-eight million, eight hundred eleven thousand, one hundred forty".