78613820 has 24 divisors (see below), whose sum is σ = 165564000. Its totient is φ = 31355072.

The previous prime is 78613817. The next prime is 78613837. The reversal of 78613820 is 2831687.

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, 1706 + ... + 12654.

It is an arithmetic number, because the mean of its divisors is an integer number (6898500).

Almost surely, 2^78613820 is an apocalyptic number.

It is an amenable number.

78613820 is an abundant number, since it is smaller than the sum of its proper divisors (86950180).

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

78613820 is a wasteful number, since it uses less digits than its factorization.

78613820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11317 (or 11315 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 78613820 is about 8866.4434809003. The cubic root of 78613820 is about 428.3837287052.

The spelling of 78613820 in words is "seventy-eight million, six hundred thirteen thousand, eight hundred twenty".