78624990 has 48 divisors (see below), whose sum is σ = 211026816. Its totient is φ = 20289600.

The previous prime is 78624967. The next prime is 78625007. The reversal of 78624990 is 9942687.

It is a happy number.

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 (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11301 + ... + 16880.

It is an arithmetic number, because the mean of its divisors is an integer number (4396392).

Almost surely, 2^78624990 is an apocalyptic number.

78624990 is an abundant number, since it is smaller than the sum of its proper divisors (132401826).

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

78624990 is a wasteful number, since it uses less digits than its factorization.

78624990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28225 (or 28222 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 78624990 is about 8867.0733616002. The cubic root of 78624990 is about 428.4040169940.

The spelling of 78624990 in words is "seventy-eight million, six hundred twenty-four thousand, nine hundred ninety".