31728828 has 24 divisors (see below), whose sum is σ = 74303488. Its totient is φ = 10537776.

The previous prime is 31728811. The next prime is 31728857. The reversal of 31728828 is 82882713.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1276 + ... + 8067.

Almost surely, 2^31728828 is an apocalyptic number.

It is an amenable number.

31728828 is an abundant number, since it is smaller than the sum of its proper divisors (42574660).

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

31728828 is a wasteful number, since it uses less digits than its factorization.

31728828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9633 (or 9631 counting only the distinct ones).

The product of its digits is 43008, while the sum is 39.

The square root of 31728828 is about 5632.8348102887. The cubic root of 31728828 is about 316.5808762368.

The spelling of 31728828 in words is "thirty-one million, seven hundred twenty-eight thousand, eight hundred twenty-eight".