28239650 has 12 divisors (see below), whose sum is σ = 52525842. Its totient is φ = 11295840.

The previous prime is 28239641. The next prime is 28239683. The reversal of 28239650 is 5693282.

It can be written as a sum of positive squares in 3 ways, for example, as 17631601 + 10608049 = 4199^2 + 3257^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28239650.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 282347 + ... + 282446.

Almost surely, 2^28239650 is an apocalyptic number.

28239650 is a deficient number, since it is larger than the sum of its proper divisors (24286192).

28239650 is a wasteful number, since it uses less digits than its factorization.

28239650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 564805 (or 564800 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 28239650 is about 5314.0991710731. The cubic root of 28239650 is about 304.5227688537.

The spelling of 28239650 in words is "twenty-eight million, two hundred thirty-nine thousand, six hundred fifty".