31828428 has 72 divisors (see below), whose sum is σ = 85285200. Its totient is φ = 9991296.

The previous prime is 31828427. The next prime is 31828441. The reversal of 31828428 is 82482813.

It is a happy number.

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 = 31828392 and 31828401.

It is not an unprimeable number, because it can be changed into a prime (31828421) 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, 44538 + ... + 45246.

Almost surely, 2^31828428 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 31828428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42642600).

31828428 is an abundant number, since it is smaller than the sum of its proper divisors (53456772).

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

31828428 is a wasteful number, since it uses less digits than its factorization.

31828428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 791 (or 786 counting only the distinct ones).

The product of its digits is 24576, while the sum is 36.

The square root of 31828428 is about 5641.6689020183. The cubic root of 31828428 is about 316.9117900167.

The spelling of 31828428 in words is "thirty-one million, eight hundred twenty-eight thousand, four hundred twenty-eight".