78397760016 has 45 divisors (see below), whose sum is σ = 219414245869. Its totient is φ = 26131466688.

The previous prime is 78397759981. The next prime is 78397760053. The reversal of 78397760016 is 61006779387.

The square root of 78397760016 is 279996.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 2935472400 + 75462287616 = 54180^2 + 274704^2 .

It is a super-2 number, since 2×78397760016² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3348286 + ... + 3371618.

Almost surely, 2^78397760016 is an apocalyptic number.

78397760016 is the 279996-th square number.

It is an amenable number.

78397760016 is an abundant number, since it is smaller than the sum of its proper divisors (141016485853).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78397760016 is an frugal number, since it uses more digits than its factorization.

78397760016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46680 (or 23338 counting only the distinct ones).

The product of its (nonzero) digits is 2667168, while the sum is 54.

The spelling of 78397760016 in words is "seventy-eight billion, three hundred ninety-seven million, seven hundred sixty thousand, sixteen".