28630238 has 32 divisors (see below), whose sum is σ = 53996544. Its totient is φ = 11081952.

The previous prime is 28630237. The next prime is 28630241. The reversal of 28630238 is 83203682.

It is a happy number.

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 polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6881 + ... + 10227.

It is an arithmetic number, because the mean of its divisors is an integer number (1687392).

Almost surely, 2^28630238 is an apocalyptic number.

28630238 is a deficient number, since it is larger than the sum of its proper divisors (25366306).

28630238 is a wasteful number, since it uses less digits than its factorization.

28630238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3416.

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 28630238 is about 5350.7231286995. The cubic root of 28630238 is about 305.9203161592.

The spelling of 28630238 in words is "twenty-eight million, six hundred thirty thousand, two hundred thirty-eight".