28630239 has 32 divisors (see below), whose sum is σ = 44181504. Its totient is φ = 16320480.

The previous prime is 28630237. The next prime is 28630241. The reversal of 28630239 is 93203682.

It is an interprime number because it is at equal distance from previous prime (28630237) and next prime (28630241).

It is not a de Polignac number, because 28630239 - 2¹ = 28630237 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28630237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 50572 + ... + 51134.

It is an arithmetic number, because the mean of its divisors is an integer number (1380672).

Almost surely, 2^28630239 is an apocalyptic number.

28630239 is a deficient number, since it is larger than the sum of its proper divisors (15551265).

28630239 is a wasteful number, since it uses less digits than its factorization.

28630239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 667.

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 28630239 is about 5350.7232221448. The cubic root of 28630239 is about 305.9203197210.

The spelling of 28630239 in words is "twenty-eight million, six hundred thirty thousand, two hundred thirty-nine".