28231970 has 16 divisors (see below), whose sum is σ = 54726840. Its totient is φ = 10424064.

The previous prime is 28231969. The next prime is 28232003. The reversal of 28231970 is 7913282.

It can be written as a sum of positive squares in 4 ways, for example, as 15437041 + 12794929 = 3929^2 + 3577^2 .

It is a Curzon 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, 108455 + ... + 108714.

Almost surely, 2^28231970 is an apocalyptic number.

28231970 is a deficient number, since it is larger than the sum of its proper divisors (26494870).

28231970 is a wasteful number, since it uses less digits than its factorization.

28231970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217189.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 28231970 is about 5313.3765159266. The cubic root of 28231970 is about 304.4951605451.

The spelling of 28231970 in words is "twenty-eight million, two hundred thirty-one thousand, nine hundred seventy".