28099407 has 16 divisors (see below), whose sum is σ = 43086080. Its totient is φ = 15956352.

The previous prime is 28099387. The next prime is 28099417. The reversal of 28099407 is 70499082.

It is not a de Polignac number, because 28099407 - 2⁶ = 28099343 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28099417) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 682 + ... + 7527.

It is an arithmetic number, because the mean of its divisors is an integer number (2692880).

Almost surely, 2^28099407 is an apocalyptic number.

28099407 is a deficient number, since it is larger than the sum of its proper divisors (14986673).

28099407 is a wasteful number, since it uses less digits than its factorization.

28099407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8382.

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 28099407 is about 5300.8873785433. The cubic root of 28099407 is about 304.0178277576.

The spelling of 28099407 in words is "twenty-eight million, ninety-nine thousand, four hundred seven".