45172728 has 96 divisors (see below), whose sum is σ = 133660800. Its totient is φ = 14253408.

The previous prime is 45172727. The next prime is 45172739. The reversal of 45172728 is 82727154.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 45172692 and 45172701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45172727) 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, 36325 + ... + 37547.

It is an arithmetic number, because the mean of its divisors is an integer number (1392300).

Almost surely, 2^45172728 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 45172728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66830400).

45172728 is an abundant number, since it is smaller than the sum of its proper divisors (88488072).

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

45172728 is a wasteful number, since it uses less digits than its factorization.

45172728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1263 (or 1247 counting only the distinct ones).

The product of its digits is 31360, while the sum is 36.

The square root of 45172728 is about 6721.0659868804. The cubic root of 45172728 is about 356.1438420536.

The spelling of 45172728 in words is "forty-five million, one hundred seventy-two thousand, seven hundred twenty-eight".