31028608 has 64 divisors (see below), whose sum is σ = 68972400. Its totient is φ = 13805568.

The previous prime is 31028603. The next prime is 31028611. The reversal of 31028608 is 80682013.

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 (31028603) 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, 47935 + ... + 48577.

Almost surely, 2^31028608 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 31028608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34486200).

31028608 is an abundant number, since it is smaller than the sum of its proper divisors (37943792).

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

31028608 is a wasteful number, since it uses less digits than its factorization.

31028608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 699 (or 687 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 31028608 is about 5570.3328446333. The cubic root of 31028608 is about 314.2346684511.

The spelling of 31028608 in words is "thirty-one million, twenty-eight thousand, six hundred eight".