28748999 has 4 divisors (see below), whose sum is σ = 28853064. Its totient is φ = 28644936.

The previous prime is 28748981. The next prime is 28749013. The reversal of 28748999 is 99984782.

It is a happy number.

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 28748999 - 2⁸ = 28748743 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 (28748939) 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, 51617 + ... + 52170.

It is an arithmetic number, because the mean of its divisors is an integer number (7213266).

Almost surely, 2^28748999 is an apocalyptic number.

28748999 is a deficient number, since it is larger than the sum of its proper divisors (104065).

28748999 is a wasteful number, since it uses less digits than its factorization.

28748999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104064.

The product of its digits is 2612736, while the sum is 56.

The square root of 28748999 is about 5361.8093028380. The cubic root of 28748999 is about 306.3427283273.

The spelling of 28748999 in words is "twenty-eight million, seven hundred forty-eight thousand, nine hundred ninety-nine".