78630990 has 16 divisors (see below), whose sum is σ = 188714448. Its totient is φ = 20968256.

The previous prime is 78630971. The next prime is 78631027. The reversal of 78630990 is 9903687.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1310487 + ... + 1310546.

It is an arithmetic number, because the mean of its divisors is an integer number (11794653).

Almost surely, 2^78630990 is an apocalyptic number.

78630990 is an abundant number, since it is smaller than the sum of its proper divisors (110083458).

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

78630990 is a wasteful number, since it uses less digits than its factorization.

78630990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2621043.

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 78630990 is about 8867.4116854920. The cubic root of 78630990 is about 428.4149141177.

The spelling of 78630990 in words is "seventy-eight million, six hundred thirty thousand, nine hundred ninety".