78209041728 has 56 divisors (see below), whose sum is σ = 209762758528. Its totient is φ = 25712557056.

The previous prime is 78209041681. The next prime is 78209041733. The reversal of 78209041728 is 82714090287.

It is a super-2 number, since 2×78209041728² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

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, 2775976 + ... + 2804007.

Almost surely, 2^78209041728 is an apocalyptic number.

It is an amenable number.

78209041728 is an abundant number, since it is smaller than the sum of its proper divisors (131553716800).

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

78209041728 is a wasteful number, since it uses less digits than its factorization.

78209041728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5580071 (or 5580061 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 48.

The spelling of 78209041728 in words is "seventy-eight billion, two hundred nine million, forty-one thousand, seven hundred twenty-eight".