78221328418 has 16 divisors (see below), whose sum is σ = 123566778720. Its totient is φ = 37034382816.

The previous prime is 78221328391. The next prime is 78221328433. The reversal of 78221328418 is 81482312287.

It is a happy number.

It is a super-2 number, since 2×78221328418² (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 7 ways as a sum of consecutive naturals, for example, 414955 + ... + 573262.

It is an arithmetic number, because the mean of its divisors is an integer number (7722923670).

Almost surely, 2^78221328418 is an apocalyptic number.

78221328418 is a deficient number, since it is larger than the sum of its proper divisors (45345450302).

78221328418 is a wasteful number, since it uses less digits than its factorization.

78221328418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 990321.

The product of its digits is 344064, while the sum is 46.

The spelling of 78221328418 in words is "seventy-eight billion, two hundred twenty-one million, three hundred twenty-eight thousand, four hundred eighteen".