78366013 has 24 divisors (see below), whose sum is σ = 91929600. Its totient is φ = 66559680.

The previous prime is 78365977. The next prime is 78366017. The reversal of 78366013 is 31066387.

It is not a de Polignac number, because 78366013 - 2⁹ = 78365501 is a prime.

It is a super-2 number, since 2×78366013² = 12282463987032338, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78366013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78366017) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 204420 + ... + 204802.

It is an arithmetic number, because the mean of its divisors is an integer number (3830400).

Almost surely, 2^78366013 is an apocalyptic number.

It is an amenable number.

78366013 is a deficient number, since it is larger than the sum of its proper divisors (13563587).

78366013 is a wasteful number, since it uses less digits than its factorization.

78366013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513 (or 502 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 78366013 is about 8852.4580202337. The cubic root of 78366013 is about 427.9331369187.

The spelling of 78366013 in words is "seventy-eight million, three hundred sixty-six thousand, thirteen".