28239718 has 16 divisors (see below), whose sum is σ = 45926496. Its totient is φ = 12945600.

The previous prime is 28239713. The next prime is 28239727. The reversal of 28239718 is 81793282.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28239713) 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, 330 + ... + 7522.

It is an arithmetic number, because the mean of its divisors is an integer number (2870406).

Almost surely, 2^28239718 is an apocalyptic number.

28239718 is a deficient number, since it is larger than the sum of its proper divisors (17686778).

28239718 is a wasteful number, since it uses less digits than its factorization.

28239718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7359.

The product of its digits is 48384, while the sum is 40.

The square root of 28239718 is about 5314.1055691433. The cubic root of 28239718 is about 304.5230132799.

It can be divided in two parts, 282 and 39718, that added together give a square (40000 = 200²).

The spelling of 28239718 in words is "twenty-eight million, two hundred thirty-nine thousand, seven hundred eighteen".