78168762644 has 24 divisors (see below), whose sum is σ = 156351326208. Its totient is φ = 33497940960.

The previous prime is 78168762629. The next prime is 78168762689. The reversal of 78168762644 is 44626786187.

It is a super-2 number, since 2×78168762644² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 216014 + ... + 450554.

It is an arithmetic number, because the mean of its divisors is an integer number (6514638592).

Almost surely, 2^78168762644 is an apocalyptic number.

It is an amenable number.

78168762644 is an abundant number, since it is smaller than the sum of its proper divisors (78182563564).

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

78168762644 is a wasteful number, since it uses less digits than its factorization.

78168762644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246455 (or 246453 counting only the distinct ones).

The product of its digits is 21676032, while the sum is 59.

The spelling of 78168762644 in words is "seventy-eight billion, one hundred sixty-eight million, seven hundred sixty-two thousand, six hundred forty-four".