78012499 has 16 divisors (see below), whose sum is σ = 83776000. Its totient is φ = 72433440.

The previous prime is 78012497. The next prime is 78012503. The reversal of 78012499 is 99421087.

It is a cyclic number.

It is not a de Polignac number, because 78012499 - 2¹ = 78012497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78012491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 287734 + ... + 288004.

It is an arithmetic number, because the mean of its divisors is an integer number (5236000).

Almost surely, 2^78012499 is an apocalyptic number.

78012499 is a deficient number, since it is larger than the sum of its proper divisors (5763501).

78012499 is a wasteful number, since it uses less digits than its factorization.

78012499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 78012499 is about 8832.4684545149. The cubic root of 78012499 is about 427.2886891564.

The spelling of 78012499 in words is "seventy-eight million, twelve thousand, four hundred ninety-nine".