28501239 has 16 divisors (see below), whose sum is σ = 41021792. Its totient is φ = 17497728.

The previous prime is 28501237. The next prime is 28501241. The reversal of 28501239 is 93210582.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28501237) and next prime (28501241).

It is not a de Polignac number, because 28501239 - 2¹ = 28501237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28501237) 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, 28089 + ... + 29085.

It is an arithmetic number, because the mean of its divisors is an integer number (2563862).

Almost surely, 2^28501239 is an apocalyptic number.

28501239 is a deficient number, since it is larger than the sum of its proper divisors (12520553).

28501239 is a wasteful number, since it uses less digits than its factorization.

28501239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1746.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 28501239 is about 5338.6551677365. The cubic root of 28501239 is about 305.4601635791.

The spelling of 28501239 in words is "twenty-eight million, five hundred one thousand, two hundred thirty-nine".