31442280 has 64 divisors (see below), whose sum is σ = 95947200. Its totient is φ = 8240640.

The previous prime is 31442273. The next prime is 31442347. The reversal of 31442280 is 8224413.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 31442280.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4860 + ... + 9300.

It is an arithmetic number, because the mean of its divisors is an integer number (1499175).

Almost surely, 2^31442280 is an apocalyptic number.

31442280 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31442280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47973600).

31442280 is an abundant number, since it is smaller than the sum of its proper divisors (64504920).

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

31442280 is a wasteful number, since it uses less digits than its factorization.

31442280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4514 (or 4510 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 31442280 is about 5607.3416161315. The cubic root of 31442280 is about 315.6249623240.

Adding to 31442280 its reverse (8224413), we get a palindrome (39666693).

The spelling of 31442280 in words is "thirty-one million, four hundred forty-two thousand, two hundred eighty".