78122348642 has 54 divisors (see below), whose sum is σ = 132848886051. Its totient is φ = 34436619360.

The previous prime is 78122348627. The next prime is 78122348663. The reversal of 78122348642 is 24684322187.

It can be written as a sum of positive squares in 5 ways, for example, as 33123636001 + 44998712641 = 181999^2 + 212129^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=197639.

It is a super-2 number, since 2×78122348642² (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 26 ways as a sum of consecutive naturals, for example, 118187792 + ... + 118188452.

Almost surely, 2^78122348642 is an apocalyptic number.

78122348642 is a deficient number, since it is larger than the sum of its proper divisors (54726537409).

78122348642 is an equidigital number, since it uses as much as digits as its factorization.

78122348642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1396 (or 699 counting only the distinct ones).

The product of its digits is 1032192, while the sum is 47.

The spelling of 78122348642 in words is "seventy-eight billion, one hundred twenty-two million, three hundred forty-eight thousand, six hundred forty-two".