78772414644 has 144 divisors (see below), whose sum is σ = 248932110336. Its totient is φ = 20404353600.

The previous prime is 78772414619. The next prime is 78772414717. The reversal of 78772414644 is 44641427787.

78772414644 is a `hidden beast` number, since 78 + 7 + 72 + 41 + 464 + 4 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 978609 + ... + 1056039.

Almost surely, 2^78772414644 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78772414644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (124466055168).

78772414644 is an abundant number, since it is smaller than the sum of its proper divisors (170159695692).

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

78772414644 is a wasteful number, since it uses less digits than its factorization.

78772414644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77826 (or 77821 counting only the distinct ones).

The product of its digits is 8429568, while the sum is 54.

The spelling of 78772414644 in words is "seventy-eight billion, seven hundred seventy-two million, four hundred fourteen thousand, six hundred forty-four".