31428828 has 36 divisors (see below), whose sum is σ = 80797080. Its totient is φ = 10298016.

The previous prime is 31428827. The next prime is 31428851. The reversal of 31428828 is 82882413.

It is a happy number.

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 = 31428792 and 31428801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31428827) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5275 + ... + 9522.

Almost surely, 2^31428828 is an apocalyptic number.

It is an amenable number.

31428828 is an abundant number, since it is smaller than the sum of its proper divisors (49368252).

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

31428828 is a wasteful number, since it uses less digits than its factorization.

31428828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14866 (or 14861 counting only the distinct ones).

The product of its digits is 24576, while the sum is 36.

The square root of 31428828 is about 5606.1419889261. The cubic root of 31428828 is about 315.5799444623.

The spelling of 31428828 in words is "thirty-one million, four hundred twenty-eight thousand, eight hundred twenty-eight".