28198815 has 8 divisors (see below), whose sum is σ = 45118128. Its totient is φ = 15039360.

The previous prime is 28198799. The next prime is 28198823. The reversal of 28198815 is 51889182.

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

It is not a de Polignac number, because 28198815 - 2⁴ = 28198799 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 939946 + ... + 939975.

It is an arithmetic number, because the mean of its divisors is an integer number (5639766).

Almost surely, 2^28198815 is an apocalyptic number.

28198815 is a deficient number, since it is larger than the sum of its proper divisors (16919313).

28198815 is a wasteful number, since it uses less digits than its factorization.

28198815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1879929.

The product of its digits is 46080, while the sum is 42.

The square root of 28198815 is about 5310.2556435637. The cubic root of 28198815 is about 304.3759163972.

The spelling of 28198815 in words is "twenty-eight million, one hundred ninety-eight thousand, eight hundred fifteen".