28867879 has 4 divisors (see below), whose sum is σ = 29165584. Its totient is φ = 28570176.

The previous prime is 28867877. The next prime is 28867901. The reversal of 28867879 is 97876882.

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 28867879 - 2¹ = 28867877 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 (28867873) 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, 148707 + ... + 148900.

It is an arithmetic number, because the mean of its divisors is an integer number (7291396).

Almost surely, 2^28867879 is an apocalyptic number.

28867879 is a deficient number, since it is larger than the sum of its proper divisors (297705).

28867879 is an equidigital number, since it uses as much as digits as its factorization.

28867879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297704.

The product of its digits is 2709504, while the sum is 55.

The square root of 28867879 is about 5372.8836763883. The cubic root of 28867879 is about 306.7644002975.

The spelling of 28867879 in words is "twenty-eight million, eight hundred sixty-seven thousand, eight hundred seventy-nine".