31299968 has 64 divisors (see below), whose sum is σ = 72028320. Its totient is φ = 13271040.

The previous prime is 31299967. The next prime is 31299971. The reversal of 31299968 is 86999213.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31299967) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 162080 + ... + 162272.

Almost surely, 2^31299968 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 31299968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36014160).

31299968 is an abundant number, since it is smaller than the sum of its proper divisors (40728352).

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

31299968 is a wasteful number, since it uses less digits than its factorization.

31299968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395 (or 383 counting only the distinct ones).

The product of its digits is 209952, while the sum is 47.

The square root of 31299968 is about 5594.6374323990. The cubic root of 31299968 is about 315.1480550334.

The spelling of 31299968 in words is "thirty-one million, two hundred ninety-nine thousand, nine hundred sixty-eight".