28029899 has 4 divisors (see below), whose sum is σ = 28063464. Its totient is φ = 27996336.

The previous prime is 28029887. The next prime is 28029901. The reversal of 28029899 is 99892082.

It is a happy number.

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-28029899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28029839) 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, 15497 + ... + 17210.

It is an arithmetic number, because the mean of its divisors is an integer number (7015866).

Almost surely, 2^28029899 is an apocalyptic number.

28029899 is a deficient number, since it is larger than the sum of its proper divisors (33565).

28029899 is an equidigital number, since it uses as much as digits as its factorization.

28029899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33564.

The product of its (nonzero) digits is 186624, while the sum is 47.

The square root of 28029899 is about 5294.3270582766. The cubic root of 28029899 is about 303.7669432312.

The spelling of 28029899 in words is "twenty-eight million, twenty-nine thousand, eight hundred ninety-nine".