31457322 has 72 divisors (see below), whose sum is σ = 76737024. Its totient is φ = 9653904.

The previous prime is 31457311. The next prime is 31457329. The reversal of 31457322 is 22375413.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31457329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 81943 + ... + 82325.

It is an arithmetic number, because the mean of its divisors is an integer number (1065792).

Almost surely, 2^31457322 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31457322, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38368512).

31457322 is an abundant number, since it is smaller than the sum of its proper divisors (45279702).

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

31457322 is a wasteful number, since it uses less digits than its factorization.

31457322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426 (or 401 counting only the distinct ones).

The product of its digits is 5040, while the sum is 27.

The square root of 31457322 is about 5608.6827330488. The cubic root of 31457322 is about 315.6752860048.

The spelling of 31457322 in words is "thirty-one million, four hundred fifty-seven thousand, three hundred twenty-two".