78158888728 has 32 divisors (see below), whose sum is σ = 147959472960. Its totient is φ = 38703237280.

The previous prime is 78158888723. The next prime is 78158888741. The reversal of 78158888728 is 82788885187.

It is a super-2 number, since 2×78158888728² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78158888723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3593775 + ... + 3615457.

It is an arithmetic number, because the mean of its divisors is an integer number (4623733530).

Almost surely, 2^78158888728 is an apocalyptic number.

It is an amenable number.

78158888728 is a deficient number, since it is larger than the sum of its proper divisors (69800584232).

78158888728 is a wasteful number, since it uses less digits than its factorization.

78158888728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26007 (or 26003 counting only the distinct ones).

The product of its digits is 128450560, while the sum is 70.

The spelling of 78158888728 in words is "seventy-eight billion, one hundred fifty-eight million, eight hundred eighty-eight thousand, seven hundred twenty-eight".