31390068 has 12 divisors (see below), whose sum is σ = 73243520. Its totient is φ = 10463352.

The previous prime is 31390067. The next prime is 31390069. The reversal of 31390068 is 86009313.

It is an interprime number because it is at equal distance from previous prime (31390067) and next prime (31390069).

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31390067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1307908 + ... + 1307931.

Almost surely, 2^31390068 is an apocalyptic number.

It is an amenable number.

31390068 is an abundant number, since it is smaller than the sum of its proper divisors (41853452).

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

31390068 is a wasteful number, since it uses less digits than its factorization.

31390068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2615846 (or 2615844 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 31390068 is about 5602.6839996559. The cubic root of 31390068 is about 315.4501601078.

The spelling of 31390068 in words is "thirty-one million, three hundred ninety thousand, sixty-eight".