78715140 has 48 divisors (see below), whose sum is σ = 251889792. Its totient is φ = 17991936.

The previous prime is 78715129. The next prime is 78715141. The reversal of 78715140 is 4151787.

It is not an unprimeable number, because it can be changed into a prime (78715141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93289 + ... + 94128.

It is an arithmetic number, because the mean of its divisors is an integer number (5247704).

Almost surely, 2^78715140 is an apocalyptic number.

78715140 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

78715140 is an abundant number, since it is smaller than the sum of its proper divisors (173174652).

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

78715140 is a wasteful number, since it uses less digits than its factorization.

78715140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187436 (or 187434 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 33.

The square root of 78715140 is about 8872.1553187487. The cubic root of 78715140 is about 428.5676879039.

The spelling of 78715140 in words is "seventy-eight million, seven hundred fifteen thousand, one hundred forty".