31425688 has 16 divisors (see below), whose sum is σ = 67340880. Its totient is φ = 13468128.

The previous prime is 31425683. The next prime is 31425727. The reversal of 31425688 is 88652413.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31425683) 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 3 ways as a sum of consecutive naturals, for example, 280531 + ... + 280642.

It is an arithmetic number, because the mean of its divisors is an integer number (4208805).

Almost surely, 2^31425688 is an apocalyptic number.

It is an amenable number.

31425688 is an abundant number, since it is smaller than the sum of its proper divisors (35915192).

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

31425688 is a wasteful number, since it uses less digits than its factorization.

31425688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 561186 (or 561182 counting only the distinct ones).

The product of its digits is 46080, while the sum is 37.

The square root of 31425688 is about 5605.8619319423. The cubic root of 31425688 is about 315.5694344296.

The spelling of 31425688 in words is "thirty-one million, four hundred twenty-five thousand, six hundred eighty-eight".