28939899 has 8 divisors (see below), whose sum is σ = 40856400. Its totient is φ = 18158336.

The previous prime is 28939877. The next prime is 28939949. The reversal of 28939899 is 99893982.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28939899 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28939829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 283674 + ... + 283775.

It is an arithmetic number, because the mean of its divisors is an integer number (5107050).

Almost surely, 2^28939899 is an apocalyptic number.

28939899 is a deficient number, since it is larger than the sum of its proper divisors (11916501).

28939899 is a wasteful number, since it uses less digits than its factorization.

28939899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 567469.

The product of its digits is 2519424, while the sum is 57.

The square root of 28939899 is about 5379.5816751863. The cubic root of 28939899 is about 307.0192951900.

The spelling of 28939899 in words is "twenty-eight million, nine hundred thirty-nine thousand, eight hundred ninety-nine".