31372272 has 60 divisors (see below), whose sum is σ = 91061880. Its totient is φ = 10456128.

The previous prime is 31372219. The next prime is 31372283. The reversal of 31372272 is 27227313.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 147 + ... + 7922.

It is an arithmetic number, because the mean of its divisors is an integer number (1517698).

Almost surely, 2^31372272 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 31372272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45530940).

31372272 is an abundant number, since it is smaller than the sum of its proper divisors (59689608).

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

31372272 is an equidigital number, since it uses as much as digits as its factorization.

31372272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8092 (or 8074 counting only the distinct ones).

The product of its digits is 3528, while the sum is 27.

The square root of 31372272 is about 5601.0956071112. The cubic root of 31372272 is about 315.3905360227.

Adding to 31372272 its reverse (27227313), we get a palindrome (58599585).

The spelling of 31372272 in words is "thirty-one million, three hundred seventy-two thousand, two hundred seventy-two".