28239651 has 16 divisors (see below), whose sum is σ = 45640320. Its totient is φ = 17114760.

The previous prime is 28239641. The next prime is 28239683. The reversal of 28239651 is 15693282.

It is not a de Polignac number, because 28239651 - 2⁹ = 28239139 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (28239641) 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, 47245 + ... + 47838.

It is an arithmetic number, because the mean of its divisors is an integer number (2852520).

Almost surely, 2^28239651 is an apocalyptic number.

28239651 is a deficient number, since it is larger than the sum of its proper divisors (17400669).

28239651 is a wasteful number, since it uses less digits than its factorization.

28239651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95103 (or 95097 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 28239651 is about 5314.0992651624. The cubic root of 28239651 is about 304.5227724482.

The spelling of 28239651 in words is "twenty-eight million, two hundred thirty-nine thousand, six hundred fifty-one".