28197915 has 16 divisors (see below), whose sum is σ = 45319200. Its totient is φ = 14971392.

The previous prime is 28197913. The next prime is 28197943. The reversal of 28197915 is 51979182.

It is not a de Polignac number, because 28197915 - 2¹ = 28197913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28197913) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 670 + ... + 7539.

It is an arithmetic number, because the mean of its divisors is an integer number (2832450).

Almost surely, 2^28197915 is an apocalyptic number.

28197915 is a deficient number, since it is larger than the sum of its proper divisors (17121285).

28197915 is a wasteful number, since it uses less digits than its factorization.

28197915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8446.

The product of its digits is 45360, while the sum is 42.

The square root of 28197915 is about 5310.1709012046. The cubic root of 28197915 is about 304.3726781850.

The spelling of 28197915 in words is "twenty-eight million, one hundred ninety-seven thousand, nine hundred fifteen".