78530990 has 64 divisors (see below), whose sum is σ = 161663040. Its totient is φ = 27279360.

The previous prime is 78530953. The next prime is 78530999. The reversal of 78530990 is 9903587.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78530999) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 132134 + ... + 132726.

It is an arithmetic number, because the mean of its divisors is an integer number (2525985).

Almost surely, 2^78530990 is an apocalyptic number.

78530990 is an abundant number, since it is smaller than the sum of its proper divisors (83132050).

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

78530990 is a wasteful number, since it uses less digits than its factorization.

78530990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 677.

The product of its (nonzero) digits is 68040, while the sum is 41.

The square root of 78530990 is about 8861.7712676417. The cubic root of 78530990 is about 428.2332229648.

The spelling of 78530990 in words is "seventy-eight million, five hundred thirty thousand, nine hundred ninety".