78739491852 has 120 divisors (see below), whose sum is σ = 235342947840. Its totient is φ = 22487764320.

The previous prime is 78739491823. The next prime is 78739491863. The reversal of 78739491852 is 25819493787.

78739491852 is a `hidden beast` number, since 7 + 87 + 394 + 91 + 85 + 2 = 666.

It is a super-2 number, since 2×78739491852² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a self number, because there is not a number n which added to its sum of digits gives 78739491852.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 7068327 + ... + 7079457.

It is an arithmetic number, because the mean of its divisors is an integer number (1961191232).

Almost surely, 2^78739491852 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 78739491852, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (117671473920).

78739491852 is an abundant number, since it is smaller than the sum of its proper divisors (156603455988).

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

78739491852 is a wasteful number, since it uses less digits than its factorization.

78739491852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14273 (or 14262 counting only the distinct ones).

The product of its digits is 30481920, while the sum is 63.

The spelling of 78739491852 in words is "seventy-eight billion, seven hundred thirty-nine million, four hundred ninety-one thousand, eight hundred fifty-two".