728169100131 has 16 divisors (see below), whose sum is σ = 1060028282880. Its totient is φ = 440950761120.

The previous prime is 728169100123. The next prime is 728169100199. The reversal of 728169100131 is 131001961827.

It is not a de Polignac number, because 728169100131 - 2³ = 728169100123 is a prime.

It is a super-2 number, since 2×728169100131² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 728169100131.

It is not an unprimeable number, because it can be changed into a prime (728169100111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9055491 + ... + 9135548.

It is an arithmetic number, because the mean of its divisors is an integer number (66251767680).

Almost surely, 2^728169100131 is an apocalyptic number.

728169100131 is a deficient number, since it is larger than the sum of its proper divisors (331859182749).

728169100131 is a wasteful number, since it uses less digits than its factorization.

728169100131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18192266.

The product of its (nonzero) digits is 18144, while the sum is 39.

The spelling of 728169100131 in words is "seven hundred twenty-eight billion, one hundred sixty-nine million, one hundred thousand, one hundred thirty-one".