28915899 has 16 divisors (see below), whose sum is σ = 40995072. Its totient is φ = 18088928.

The previous prime is 28915897. The next prime is 28915919. The reversal of 28915899 is 99851982.

It is a cyclic number.

It is not a de Polignac number, because 28915899 - 2¹ = 28915897 is a prime.

It is a super-2 number, since 2×28915899² = 1672258429956402, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28915897) 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, 297 + ... + 7610.

It is an arithmetic number, because the mean of its divisors is an integer number (2562192).

Almost surely, 2^28915899 is an apocalyptic number.

28915899 is a deficient number, since it is larger than the sum of its proper divisors (12079173).

28915899 is a wasteful number, since it uses less digits than its factorization.

28915899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7986.

The product of its digits is 466560, while the sum is 51.

The square root of 28915899 is about 5377.3505558035. The cubic root of 28915899 is about 306.9344008495.

The spelling of 28915899 in words is "twenty-eight million, nine hundred fifteen thousand, eight hundred ninety-nine".