28722599 has 4 divisors (see below), whose sum is σ = 28743120. Its totient is φ = 28702080.

The previous prime is 28722587. The next prime is 28722601. The reversal of 28722599 is 99522782.

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 28722599 - 2¹⁶ = 28657063 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 (28722539) 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, 7994 + ... + 11015.

It is an arithmetic number, because the mean of its divisors is an integer number (7185780).

Almost surely, 2^28722599 is an apocalyptic number.

28722599 is a deficient number, since it is larger than the sum of its proper divisors (20521).

28722599 is a wasteful number, since it uses less digits than its factorization.

28722599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20520.

The product of its digits is 181440, while the sum is 44.

The square root of 28722599 is about 5359.3468818504. The cubic root of 28722599 is about 306.2489288315.

The spelling of 28722599 in words is "twenty-eight million, seven hundred twenty-two thousand, five hundred ninety-nine".