31442928 has 160 divisors (see below), whose sum is σ = 97708032. Its totient is φ = 8601600.

The previous prime is 31442921. The next prime is 31442951. The reversal of 31442928 is 82924413.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31442921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 278200 + ... + 278312.

Almost surely, 2^31442928 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 31442928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48854016).

31442928 is an abundant number, since it is smaller than the sum of its proper divisors (66265104).

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

31442928 is a wasteful number, since it uses less digits than its factorization.

31442928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183 (or 177 counting only the distinct ones).

The product of its digits is 13824, while the sum is 33.

The square root of 31442928 is about 5607.3993972251. The cubic root of 31442928 is about 315.6271305676.

The spelling of 31442928 in words is "thirty-one million, four hundred forty-two thousand, nine hundred twenty-eight".