31242888 has 64 divisors (see below), whose sum is σ = 87648000. Its totient is φ = 10310976.

The previous prime is 31242881. The next prime is 31242899. The reversal of 31242888 is 88824213.

It is a happy number.

It is a super-2 number, since 2×31242888² = 1952236101161088, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (31242881) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 22881 + ... + 24207.

It is an arithmetic number, because the mean of its divisors is an integer number (1369500).

Almost surely, 2^31242888 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 31242888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43824000).

31242888 is an abundant number, since it is smaller than the sum of its proper divisors (56405112).

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

31242888 is a wasteful number, since it uses less digits than its factorization.

31242888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1451 (or 1441 counting only the distinct ones).

The product of its digits is 24576, while the sum is 36.

The square root of 31242888 is about 5589.5337909346. The cubic root of 31242888 is about 314.9563658381.

The spelling of 31242888 in words is "thirty-one million, two hundred forty-two thousand, eight hundred eighty-eight".