28900999 has 4 divisors (see below), whose sum is σ = 28929600. Its totient is φ = 28872400.

The previous prime is 28900997. The next prime is 28901017. The reversal of 28900999 is 99900982.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99900982 = 2 ⋅49950491.

It is a cyclic number.

It is not a de Polignac number, because 28900999 - 2¹ = 28900997 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 (28900997) 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, 12727 + ... + 14824.

It is an arithmetic number, because the mean of its divisors is an integer number (7232400).

Almost surely, 2^28900999 is an apocalyptic number.

28900999 is a deficient number, since it is larger than the sum of its proper divisors (28601).

28900999 is a wasteful number, since it uses less digits than its factorization.

28900999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28600.

The product of its (nonzero) digits is 104976, while the sum is 46.

The square root of 28900999 is about 5375.9649366416. The cubic root of 28900999 is about 306.8816719762.

The spelling of 28900999 in words is "twenty-eight million, nine hundred thousand, nine hundred ninety-nine".