31325688 has 48 divisors (see below), whose sum is σ = 86654880. Its totient is φ = 10218624.

The previous prime is 31325677. The next prime is 31325689. The reversal of 31325688 is 88652313.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31325689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1245 + ... + 8012.

It is an arithmetic number, because the mean of its divisors is an integer number (1805310).

Almost surely, 2^31325688 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 31325688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43327440).

31325688 is an abundant number, since it is smaller than the sum of its proper divisors (55329192).

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

31325688 is a wasteful number, since it uses less digits than its factorization.

31325688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9316 (or 9309 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 31325688 is about 5596.9355901243. The cubic root of 31325688 is about 315.2343531919.

The spelling of 31325688 in words is "thirty-one million, three hundred twenty-five thousand, six hundred eighty-eight".