31806828 has 36 divisors (see below), whose sum is σ = 82577040. Its totient is φ = 10315296.

The previous prime is 31806811. The next prime is 31806833. The reversal of 31806828 is 82860813.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 31806792 and 31806801.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10608 + ... + 13271.

Almost surely, 2^31806828 is an apocalyptic number.

It is an amenable number.

31806828 is an abundant number, since it is smaller than the sum of its proper divisors (50770212).

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

31806828 is a wasteful number, since it uses less digits than its factorization.

31806828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23926 (or 23921 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 31806828 is about 5639.7542499652. The cubic root of 31806828 is about 316.8400842684.

It can be divided in two parts, 318068 and 28, that added together give a square (318096 = 564²).

The spelling of 31806828 in words is "thirty-one million, eight hundred six thousand, eight hundred twenty-eight".