28610399 has 4 divisors (see below), whose sum is σ = 28736664. Its totient is φ = 28484136.

The previous prime is 28610389. The next prime is 28610401. The reversal of 28610399 is 99301682.

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

It is a cyclic number.

It is not a de Polignac number, because 28610399 - 2²⁰ = 27561823 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 (28610389) 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, 62792 + ... + 63245.

It is an arithmetic number, because the mean of its divisors is an integer number (7184166).

Almost surely, 2^28610399 is an apocalyptic number.

28610399 is a deficient number, since it is larger than the sum of its proper divisors (126265).

28610399 is a wasteful number, since it uses less digits than its factorization.

28610399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126264.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 28610399 is about 5348.8689458614. The cubic root of 28610399 is about 305.8496384892.

The spelling of 28610399 in words is "twenty-eight million, six hundred ten thousand, three hundred ninety-nine".