28239937 has 16 divisors (see below), whose sum is σ = 31959360. Its totient is φ = 24731200.

The previous prime is 28239899. The next prime is 28239971. The reversal of 28239937 is 73993282.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28239937 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28239893 and 28239902.

It is not an unprimeable number, because it can be changed into a prime (28239437) 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, 33987 + ... + 34807.

It is an arithmetic number, because the mean of its divisors is an integer number (1997460).

Almost surely, 2^28239937 is an apocalyptic number.

It is an amenable number.

28239937 is a deficient number, since it is larger than the sum of its proper divisors (3719423).

28239937 is a wasteful number, since it uses less digits than its factorization.

28239937 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 944.

The product of its digits is 163296, while the sum is 43.

The square root of 28239937 is about 5314.1261746406. The cubic root of 28239937 is about 304.5238004734.

The spelling of 28239937 in words is "twenty-eight million, two hundred thirty-nine thousand, nine hundred thirty-seven".