28052399 has 4 divisors (see below), whose sum is σ = 28067664. Its totient is φ = 28037136.

The previous prime is 28052393. The next prime is 28052407. The reversal of 28052399 is 99325082.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28052399 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 (28052393) 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, 4427 + ... + 8700.

It is an arithmetic number, because the mean of its divisors is an integer number (7016916).

Almost surely, 2^28052399 is an apocalyptic number.

28052399 is a deficient number, since it is larger than the sum of its proper divisors (15265).

28052399 is a wasteful number, since it uses less digits than its factorization.

28052399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15264.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 28052399 is about 5296.4515479706. The cubic root of 28052399 is about 303.8482008465.

The spelling of 28052399 in words is "twenty-eight million, fifty-two thousand, three hundred ninety-nine".