45215172 has 60 divisors (see below), whose sum is σ = 125169660. Its totient is φ = 14183424.

The previous prime is 45215167. The next prime is 45215179. The reversal of 45215172 is 27151254.

It can be written as a sum of positive squares in 2 ways, for example, as 17589636 + 27625536 = 4194^2 + 5256^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (45215179) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1404 + ... + 9612.

It is an arithmetic number, because the mean of its divisors is an integer number (2086161).

Almost surely, 2^45215172 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 45215172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62584830).

45215172 is an abundant number, since it is smaller than the sum of its proper divisors (79954488).

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

45215172 is a wasteful number, since it uses less digits than its factorization.

45215172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8242 (or 8231 counting only the distinct ones).

The product of its digits is 2800, while the sum is 27.

The square root of 45215172 is about 6724.2227803665. Note that the first 3 decimals coincide. The cubic root of 45215172 is about 356.2553506122.

The spelling of 45215172 in words is "forty-five million, two hundred fifteen thousand, one hundred seventy-two".