28750239 has 12 divisors (see below), whose sum is σ = 47460816. Its totient is φ = 16428672.

The previous prime is 28750217. The next prime is 28750259. The reversal of 28750239 is 93205782.

It is a happy number.

It is not a de Polignac number, because 28750239 - 2¹² = 28746143 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28750259) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 228114 + ... + 228239.

It is an arithmetic number, because the mean of its divisors is an integer number (3955068).

Almost surely, 2^28750239 is an apocalyptic number.

28750239 is a deficient number, since it is larger than the sum of its proper divisors (18710577).

28750239 is a wasteful number, since it uses less digits than its factorization.

28750239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456366 (or 456363 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 28750239 is about 5361.9249342004. The cubic root of 28750239 is about 306.3471326491.

The spelling of 28750239 in words is "twenty-eight million, seven hundred fifty thousand, two hundred thirty-nine".