31358028 has 48 divisors (see below), whose sum is σ = 80156160. Its totient is φ = 9482304.

The previous prime is 31358017. The next prime is 31358053. The reversal of 31358028 is 82085313.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 31357986 and 31358004.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7501 + ... + 10907.

It is an arithmetic number, because the mean of its divisors is an integer number (1669920).

Almost surely, 2^31358028 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 31358028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40078080).

31358028 is an abundant number, since it is smaller than the sum of its proper divisors (48798132).

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

31358028 is a wasteful number, since it uses less digits than its factorization.

31358028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3486 (or 3484 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 31358028 is about 5599.8239258034. The cubic root of 31358028 is about 315.3427963832.

The spelling of 31358028 in words is "thirty-one million, three hundred fifty-eight thousand, twenty-eight".