31242564 has 24 divisors (see below), whose sum is σ = 80999520. Its totient is φ = 10414152.

The previous prime is 31242557. The next prime is 31242577. The reversal of 31242564 is 46524213.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 144534 + ... + 144749.

It is an arithmetic number, because the mean of its divisors is an integer number (3374980).

Almost surely, 2^31242564 is an apocalyptic number.

It is an amenable number.

31242564 is an abundant number, since it is smaller than the sum of its proper divisors (49756956).

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

31242564 is a wasteful number, since it uses less digits than its factorization.

31242564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289296 (or 289288 counting only the distinct ones).

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

The square root of 31242564 is about 5589.5048081203. The cubic root of 31242564 is about 314.9552770974.

Adding to 31242564 its reverse (46524213), we get a palindrome (77766777).

The spelling of 31242564 in words is "thirty-one million, two hundred forty-two thousand, five hundred sixty-four".