78816580 has 24 divisors (see below), whose sum is σ = 165739392. Its totient is φ = 31483872.

The previous prime is 78816559. The next prime is 78816583. The reversal of 78816580 is 8561887.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (78816583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15429 + ... + 19891.

It is an arithmetic number, because the mean of its divisors is an integer number (6905808).

Almost surely, 2^78816580 is an apocalyptic number.

It is an amenable number.

78816580 is an abundant number, since it is smaller than the sum of its proper divisors (86922812).

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

78816580 is a wasteful number, since it uses less digits than its factorization.

78816580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5355 (or 5353 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 43.

The square root of 78816580 is about 8877.8702400970. The cubic root of 78816580 is about 428.7517069067.

The spelling of 78816580 in words is "seventy-eight million, eight hundred sixteen thousand, five hundred eighty".