78581013 has 16 divisors (see below), whose sum is σ = 119961600. Its totient is φ = 44821296.

The previous prime is 78581011. The next prime is 78581059. The reversal of 78581013 is 31018587.

It is not a de Polignac number, because 78581013 - 2¹ = 78581011 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78581011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9456 + ... + 15702.

It is an arithmetic number, because the mean of its divisors is an integer number (7497600).

Almost surely, 2^78581013 is an apocalyptic number.

It is an amenable number.

78581013 is a deficient number, since it is larger than the sum of its proper divisors (41380587).

78581013 is a wasteful number, since it uses less digits than its factorization.

78581013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6856.

The product of its (nonzero) digits is 6720, while the sum is 33.

The square root of 78581013 is about 8864.5932224778. The cubic root of 78581013 is about 428.3241295981.

The spelling of 78581013 in words is "seventy-eight million, five hundred eighty-one thousand, thirteen".