15728717172 has 72 divisors (see below), whose sum is σ = 42884034816. Its totient is φ = 4473729792.

The previous prime is 15728717171. The next prime is 15728717183. The reversal of 15728717172 is 27171782751.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15728717171) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 71148 + ... + 191100.

Almost surely, 2^15728717172 is an apocalyptic number.

15728717172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15728717172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21442017408).

15728717172 is an abundant number, since it is smaller than the sum of its proper divisors (27155317644).

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

15728717172 is a wasteful number, since it uses less digits than its factorization.

15728717172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120197 (or 120188 counting only the distinct ones).

The product of its digits is 384160, while the sum is 48.

The spelling of 15728717172 in words is "fifteen billion, seven hundred twenty-eight million, seven hundred seventeen thousand, one hundred seventy-two".