31422564 has 72 divisors (see below), whose sum is σ = 82937400. Its totient is φ = 10022400.

The previous prime is 31422557. The next prime is 31422571. The reversal of 31422564 is 46522413.

It is an interprime number because it is at equal distance from previous prime (31422557) and next prime (31422571).

It can be written as a sum of positive squares in 4 ways, for example, as 152100 + 31270464 = 390^2 + 5592^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 89862 + ... + 90210.

Almost surely, 2^31422564 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 31422564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41468700).

31422564 is an abundant number, since it is smaller than the sum of its proper divisors (51514836).

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

31422564 is a wasteful number, since it uses less digits than its factorization.

31422564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 461 (or 456 counting only the distinct ones).

The product of its digits is 5760, while the sum is 27.

The square root of 31422564 is about 5605.5832881155. The cubic root of 31422564 is about 315.5589772565.

Adding to 31422564 its reverse (46522413), we get a palindrome (77944977).

The spelling of 31422564 in words is "thirty-one million, four hundred twenty-two thousand, five hundred sixty-four".