28399535 has 8 divisors (see below), whose sum is σ = 35000736. Its totient is φ = 22105440.

The previous prime is 28399531. The next prime is 28399541. The reversal of 28399535 is 53599382.

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

It is not a de Polignac number, because 28399535 - 2² = 28399531 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 (28399531) 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, 76571 + ... + 76940.

It is an arithmetic number, because the mean of its divisors is an integer number (4375092).

Almost surely, 2^28399535 is an apocalyptic number.

28399535 is a deficient number, since it is larger than the sum of its proper divisors (6601201).

28399535 is a wasteful number, since it uses less digits than its factorization.

28399535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153553.

The product of its digits is 291600, while the sum is 44.

The square root of 28399535 is about 5329.1214097635. The cubic root of 28399535 is about 305.0963952231.

The spelling of 28399535 in words is "twenty-eight million, three hundred ninety-nine thousand, five hundred thirty-five".