28197197 has 24 divisors (see below), whose sum is σ = 35677440. Its totient is φ = 22135680.

The previous prime is 28197187. The next prime is 28197209. The reversal of 28197197 is 79179182.

It is not a de Polignac number, because 28197197 - 2⁴ = 28197181 is a prime.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28197137) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28373 + ... + 29349.

It is an arithmetic number, because the mean of its divisors is an integer number (1486560).

Almost surely, 2^28197197 is an apocalyptic number.

It is an amenable number.

28197197 is a deficient number, since it is larger than the sum of its proper divisors (7480243).

28197197 is a wasteful number, since it uses less digits than its factorization.

28197197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1041 (or 1034 counting only the distinct ones).

The product of its digits is 63504, while the sum is 44.

The square root of 28197197 is about 5310.1032946639. The cubic root of 28197197 is about 304.3700947619.

The spelling of 28197197 in words is "twenty-eight million, one hundred ninety-seven thousand, one hundred ninety-seven".