251028432 has 60 divisors (see below), whose sum is σ = 706176900. Its totient is φ = 83241984.

The previous prime is 251028397. The next prime is 251028433. The reversal of 251028432 is 234820152.

It can be written as a sum of positive squares in 2 ways, for example, as 113294736 + 137733696 = 10644^2 + 11736^2 .

It is a junction number, because it is equal to n+sod(n) for n = 251028396 and 251028405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251028433) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23944 + ... + 32792.

It is an arithmetic number, because the mean of its divisors is an integer number (11769615).

Almost surely, 2^251028432 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 251028432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (353088450).

251028432 is an abundant number, since it is smaller than the sum of its proper divisors (455148468).

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

251028432 is a wasteful number, since it uses less digits than its factorization.

251028432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9060 (or 9051 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 251028432 is about 15843.8767983092. The cubic root of 251028432 is about 630.8231718784.

Adding to 251028432 its reverse (234820152), we get a palindrome (485848584).

The spelling of 251028432 in words is "two hundred fifty-one million, twenty-eight thousand, four hundred thirty-two".