78394928018 has 32 divisors (see below), whose sum is σ = 137147437440. Its totient is φ = 33212309760.

The previous prime is 78394927993. The next prime is 78394928021. The reversal of 78394928018 is 81082949387.

It is a super-2 number, since 2×78394928018² (a number of 23 digits) contains 22 as substring.

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, 979013 + ... + 1056056.

It is an arithmetic number, because the mean of its divisors is an integer number (4285857420).

Almost surely, 2^78394928018 is an apocalyptic number.

78394928018 is a deficient number, since it is larger than the sum of its proper divisors (58752509422).

78394928018 is a wasteful number, since it uses less digits than its factorization.

78394928018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2035202.

The product of its (nonzero) digits is 6967296, while the sum is 59.

The spelling of 78394928018 in words is "seventy-eight billion, three hundred ninety-four million, nine hundred twenty-eight thousand, eighteen".