28415879 has 4 divisors (see below), whose sum is σ = 29651376. Its totient is φ = 27180384.

The previous prime is 28415867. The next prime is 28415899. The reversal of 28415879 is 97851482.

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 28415879 - 2²⁰ = 27367303 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 (28415899) 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, 617714 + ... + 617759.

It is an arithmetic number, because the mean of its divisors is an integer number (7412844).

Almost surely, 2^28415879 is an apocalyptic number.

28415879 is a deficient number, since it is larger than the sum of its proper divisors (1235497).

28415879 is a wasteful number, since it uses less digits than its factorization.

28415879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1235496.

The product of its digits is 161280, while the sum is 44.

The square root of 28415879 is about 5330.6546502282. The cubic root of 28415879 is about 305.1549118996.

The spelling of 28415879 in words is "twenty-eight million, four hundred fifteen thousand, eight hundred seventy-nine".