28197001 has 8 divisors (see below), whose sum is σ = 32883200. Its totient is φ = 24168564.

The previous prime is 28196989. The next prime is 28197031. The reversal of 28197001 is 10079182.

It is not a de Polignac number, because 28197001 - 2¹¹ = 28194953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28197031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40761 + ... + 41446.

It is an arithmetic number, because the mean of its divisors is an integer number (4110400).

Almost surely, 2^28197001 is an apocalyptic number.

It is an amenable number.

28197001 is a deficient number, since it is larger than the sum of its proper divisors (4686199).

28197001 is an frugal number, since it uses more digits than its factorization.

28197001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82228 (or 82214 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 28197001 is about 5310.0848392469. The cubic root of 28197001 is about 304.3693895301.

The spelling of 28197001 in words is "twenty-eight million, one hundred ninety-seven thousand, one".