78518790 has 48 divisors (see below), whose sum is σ = 233314848. Its totient is φ = 17947008.

The previous prime is 78518789. The next prime is 78518807. The reversal of 78518790 is 9781587.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 61687 + ... + 62946.

It is an arithmetic number, because the mean of its divisors is an integer number (4860726).

Almost surely, 2^78518790 is an apocalyptic number.

78518790 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

78518790 is an abundant number, since it is smaller than the sum of its proper divisors (154796058).

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

78518790 is a wasteful number, since it uses less digits than its factorization.

78518790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124653 (or 124650 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 45.

The square root of 78518790 is about 8861.0828909338. The cubic root of 78518790 is about 428.2110460897.

It can be divided in two parts, 7851 and 8790, that added together give a square (16641 = 129²).

The spelling of 78518790 in words is "seventy-eight million, five hundred eighteen thousand, seven hundred ninety".