78499477584 has 120 divisors (see below), whose sum is σ = 241097193792. Its totient is φ = 23645199360.

The previous prime is 78499477561. The next prime is 78499477591. The reversal of 78499477584 is 48577499487.

78499477584 is a `hidden beast` number, since 78 + 4 + 9 + 9 + 477 + 5 + 84 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 116152 + ... + 412904.

Almost surely, 2^78499477584 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 78499477584, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120548596896).

78499477584 is an abundant number, since it is smaller than the sum of its proper divisors (162597716208).

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

78499477584 is a wasteful number, since it uses less digits than its factorization.

78499477584 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296945 (or 296936 counting only the distinct ones).

The product of its digits is 568995840, while the sum is 72.

The spelling of 78499477584 in words is "seventy-eight billion, four hundred ninety-nine million, four hundred seventy-seven thousand, five hundred eighty-four".