31200828 has 48 divisors (see below), whose sum is σ = 74667264. Its totient is φ = 10137600.

The previous prime is 31200823. The next prime is 31200847. The reversal of 31200828 is 82800213.

It is a junction number, because it is equal to n+sod(n) for n = 31200798 and 31200807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31200823) 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 15 ways as a sum of consecutive naturals, for example, 121276 + ... + 121532.

It is an arithmetic number, because the mean of its divisors is an integer number (1555568).

Almost surely, 2^31200828 is an apocalyptic number.

It is an amenable number.

31200828 is an abundant number, since it is smaller than the sum of its proper divisors (43466436).

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

31200828 is a wasteful number, since it uses less digits than its factorization.

31200828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 482 (or 480 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 31200828 is about 5585.7701349053. The cubic root of 31200828 is about 314.8149681787.

The spelling of 31200828 in words is "thirty-one million, two hundred thousand, eight hundred twenty-eight".