28399534 has 8 divisors (see below), whose sum is σ = 43973568. Its totient is φ = 13741680.

The previous prime is 28399531. The next prime is 28399541. The reversal of 28399534 is 43599382.

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

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 3 ways as a sum of consecutive naturals, for example, 228967 + ... + 229090.

It is an arithmetic number, because the mean of its divisors is an integer number (5496696).

Almost surely, 2^28399534 is an apocalyptic number.

28399534 is a deficient number, since it is larger than the sum of its proper divisors (15574034).

28399534 is a wasteful number, since it uses less digits than its factorization.

28399534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 458090.

The product of its digits is 233280, while the sum is 43.

The square root of 28399534 is about 5329.1213159394. The cubic root of 28399534 is about 305.0963916421.

The spelling of 28399534 in words is "twenty-eight million, three hundred ninety-nine thousand, five hundred thirty-four".