28877015 has 4 divisors (see below), whose sum is σ = 34652424. Its totient is φ = 23101608.

The previous prime is 28876963. The next prime is 28877021. The reversal of 28877015 is 51077882.

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 28877015 - 2²⁴ = 12099799 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28877015.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2887697 + ... + 2887706.

It is an arithmetic number, because the mean of its divisors is an integer number (8663106).

Almost surely, 2^28877015 is an apocalyptic number.

28877015 is a deficient number, since it is larger than the sum of its proper divisors (5775409).

28877015 is an equidigital number, since it uses as much as digits as its factorization.

28877015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5775408.

The product of its (nonzero) digits is 31360, while the sum is 38.

The square root of 28877015 is about 5373.7338043487. The cubic root of 28877015 is about 306.7967581067.

The spelling of 28877015 in words is "twenty-eight million, eight hundred seventy-seven thousand, fifteen".