31428200 has 24 divisors (see below), whose sum is σ = 73071030. Its totient is φ = 12571200.

The previous prime is 31428191. The next prime is 31428253. The reversal of 31428200 is 282413.

It can be written as a sum of positive squares in 3 ways, for example, as 28281124 + 3147076 = 5318^2 + 1774^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 78371 + ... + 78770.

Almost surely, 2^31428200 is an apocalyptic number.

It is an amenable number.

31428200 is an abundant number, since it is smaller than the sum of its proper divisors (41642830).

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

31428200 is a wasteful number, since it uses less digits than its factorization.

31428200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157157 (or 157148 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 31428200 is about 5606.0859786486. The cubic root of 31428200 is about 315.5778425118.

The spelling of 31428200 in words is "thirty-one million, four hundred twenty-eight thousand, two hundred".