78613990 has 32 divisors (see below), whose sum is σ = 174162240. Its totient is φ = 24879744.

The previous prime is 78613979. The next prime is 78613991. The reversal of 78613990 is 9931687.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78613991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42285 + ... + 44104.

It is an arithmetic number, because the mean of its divisors is an integer number (5442570).

Almost surely, 2^78613990 is an apocalyptic number.

78613990 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

78613990 is an abundant number, since it is smaller than the sum of its proper divisors (95548250).

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

78613990 is a wasteful number, since it uses less digits than its factorization.

78613990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86416.

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 78613990 is about 8866.4530676026. The cubic root of 78613990 is about 428.3840374940.

The spelling of 78613990 in words is "seventy-eight million, six hundred thirteen thousand, nine hundred ninety".