78728004015 has 16 divisors (see below), whose sum is σ = 126174412896. Its totient is φ = 41918400000.

The previous prime is 78728003947. The next prime is 78728004029. The reversal of 78728004015 is 51040082787.

It is not a de Polignac number, because 78728004015 - 2⁸ = 78728003759 is a prime.

It is a super-2 number, since 2×78728004015² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4357486 + ... + 4375515.

It is an arithmetic number, because the mean of its divisors is an integer number (7885900806).

Almost surely, 2^78728004015 is an apocalyptic number.

78728004015 is a deficient number, since it is larger than the sum of its proper divisors (47446408881).

78728004015 is a wasteful number, since it uses less digits than its factorization.

78728004015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8733610.

The product of its (nonzero) digits is 125440, while the sum is 42.

The spelling of 78728004015 in words is "seventy-eight billion, seven hundred twenty-eight million, four thousand, fifteen".