31428230 has 16 divisors (see below), whose sum is σ = 56670624. Its totient is φ = 12549120.

The previous prime is 31428191. The next prime is 31428253. The reversal of 31428230 is 3282413.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31428196 and 31428205.

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, 3959 + ... + 8861.

It is an arithmetic number, because the mean of its divisors is an integer number (3541914).

Almost surely, 2^31428230 is an apocalyptic number.

31428230 is a deficient number, since it is larger than the sum of its proper divisors (25242394).

31428230 is a wasteful number, since it uses less digits than its factorization.

31428230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5551.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 31428230 is about 5606.0886543115. The cubic root of 31428230 is about 315.5779429241.

The spelling of 31428230 in words is "thirty-one million, four hundred twenty-eight thousand, two hundred thirty".