78630709922 has 6 divisors (see below), whose sum is σ = 117946659729. Its totient is φ = 39315156680.

The previous prime is 78630709921. The next prime is 78630709967. The reversal of 78630709922 is 22990703687.

It can be written as a sum of positive squares in 2 ways, for example, as 44947816081 + 33682893841 = 212009^2 + 183529^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=198281.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78630709921) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 297422 + ... + 495702.

Almost surely, 2^78630709922 is an apocalyptic number.

78630709922 is a deficient number, since it is larger than the sum of its proper divisors (39315949807).

78630709922 is an frugal number, since it uses more digits than its factorization.

78630709922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396564 (or 198283 counting only the distinct ones).

The product of its (nonzero) digits is 2286144, while the sum is 53.

The spelling of 78630709922 in words is "seventy-eight billion, six hundred thirty million, seven hundred nine thousand, nine hundred twenty-two".