78642445572 has 216 divisors, whose sum is σ = 216815639040. Its totient is φ = 24002858880.

The previous prime is 78642445561. The next prime is 78642445591. The reversal of 78642445572 is 27554424687.

78642445572 is a `hidden beast` number, since 7 + 8 + 6 + 4 + 24 + 45 + 572 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 72347613 + ... + 72348699.

Almost surely, 2^78642445572 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 78642445572, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108407819520).

78642445572 is an abundant number, since it is smaller than the sum of its proper divisors (138173193468).

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

78642445572 is a wasteful number, since it uses less digits than its factorization.

78642445572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1303 (or 1275 counting only the distinct ones).

The product of its digits is 15052800, while the sum is 54.

The spelling of 78642445572 in words is "seventy-eight billion, six hundred forty-two million, four hundred forty-five thousand, five hundred seventy-two".