28877209 has 8 divisors (see below), whose sum is σ = 30108672. Its totient is φ = 27671280.

The previous prime is 28877179. The next prime is 28877231. The reversal of 28877209 is 90277882.

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

It is a cyclic number.

It is not a de Polignac number, because 28877209 - 2⁷ = 28877081 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28877269) 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, 4057 + ... + 8614.

It is an arithmetic number, because the mean of its divisors is an integer number (3763584).

Almost surely, 2^28877209 is an apocalyptic number.

It is an amenable number.

28877209 is a deficient number, since it is larger than the sum of its proper divisors (1231463).

28877209 is a wasteful number, since it uses less digits than its factorization.

28877209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12767.

The product of its (nonzero) digits is 112896, while the sum is 43.

The square root of 28877209 is about 5373.7518550823. The cubic root of 28877209 is about 306.7974451403.

The spelling of 28877209 in words is "twenty-eight million, eight hundred seventy-seven thousand, two hundred nine".