28239895 has 8 divisors (see below), whose sum is σ = 34365600. Its totient is φ = 22273440.

The previous prime is 28239877. The next prime is 28239899. The reversal of 28239895 is 59893282.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28239895 - 2¹⁷ = 28108823 is a prime.

It is a super-2 number, since 2×28239895² = 1594983339222050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28239899) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39420 + ... + 40129.

It is an arithmetic number, because the mean of its divisors is an integer number (4295700).

Almost surely, 2^28239895 is an apocalyptic number.

28239895 is a deficient number, since it is larger than the sum of its proper divisors (6125705).

28239895 is an equidigital number, since it uses as much as digits as its factorization.

28239895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79625.

The product of its digits is 311040, while the sum is 46.

The square root of 28239895 is about 5314.1222229076. The cubic root of 28239895 is about 304.5236495051.

The spelling of 28239895 in words is "twenty-eight million, two hundred thirty-nine thousand, eight hundred ninety-five".