78759370881 has 27 divisors (see below), whose sum is σ = 114758383779. Its totient is φ = 52051047552.

The previous prime is 78759370871. The next prime is 78759370897. The reversal of 78759370881 is 18807395787.

The square root of 78759370881 is 280641.

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., 25774697025 + 52984673856 = 160545^2 + 230184^2 .

It is a de Polignac number, because none of the positive numbers 2^k-78759370881 is a prime.

It is a super-2 number, since 2×78759370881² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78759370831) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 117026961 + ... + 117027633.

Almost surely, 2^78759370881 is an apocalyptic number.

78759370881 is the 280641-st square number.

78759370881 is the 140321-st centered octagonal number.

It is an amenable number.

78759370881 is a deficient number, since it is larger than the sum of its proper divisors (35999012898).

78759370881 is an frugal number, since it uses more digits than its factorization.

78759370881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1630 (or 815 counting only the distinct ones).

The product of its (nonzero) digits is 23708160, while the sum is 63.

The spelling of 78759370881 in words is "seventy-eight billion, seven hundred fifty-nine million, three hundred seventy thousand, eight hundred eighty-one".