78712791364 has 27 divisors (see below), whose sum is σ = 138815084541. Its totient is φ = 39053673600.

The previous prime is 78712791341. The next prime is 78712791373. The reversal of 78712791364 is 46319721787.

The square root of 78712791364 is 280558.

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., 1517725764 + 77195065600 = 38958^2 + 277840^2 .

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, 84728052 + ... + 84728980.

Almost surely, 2^78712791364 is an apocalyptic number.

78712791364 is the 280558-th square number.

It is an amenable number.

78712791364 is a deficient number, since it is larger than the sum of its proper divisors (60102293177).

78712791364 is an frugal number, since it uses more digits than its factorization.

78712791364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2164 (or 1082 counting only the distinct ones).

The product of its digits is 3556224, while the sum is 55.

The spelling of 78712791364 in words is "seventy-eight billion, seven hundred twelve million, seven hundred ninety-one thousand, three hundred sixty-four".