28550999 has 4 divisors (see below), whose sum is σ = 28665000. Its totient is φ = 28437000.

The previous prime is 28550987. The next prime is 28551001. The reversal of 28550999 is 99905582.

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-28550999 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 (28550909) 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, 56624 + ... + 57125.

It is an arithmetic number, because the mean of its divisors is an integer number (7166250).

Almost surely, 2^28550999 is an apocalyptic number.

28550999 is a deficient number, since it is larger than the sum of its proper divisors (114001).

28550999 is a wasteful number, since it uses less digits than its factorization.

28550999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114000.

The product of its (nonzero) digits is 291600, while the sum is 47.

The square root of 28550999 is about 5343.3134850952. The cubic root of 28550999 is about 305.6378267402.

The spelling of 28550999 in words is "twenty-eight million, five hundred fifty thousand, nine hundred ninety-nine".