28101197 has 4 divisors (see below), whose sum is σ = 28124256. Its totient is φ = 28078140.

The previous prime is 28101173. The next prime is 28101211. The reversal of 28101197 is 79110182.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28101197 - 2¹² = 28097101 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 (28101107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9593 + ... + 12174.

It is an arithmetic number, because the mean of its divisors is an integer number (7031064).

Almost surely, 2^28101197 is an apocalyptic number.

It is an amenable number.

28101197 is a deficient number, since it is larger than the sum of its proper divisors (23059).

28101197 is a wasteful number, since it uses less digits than its factorization.

28101197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23058.

The product of its (nonzero) digits is 1008, while the sum is 29.

The square root of 28101197 is about 5301.0562155103. The cubic root of 28101197 is about 304.0242831768.

The spelling of 28101197 in words is "twenty-eight million, one hundred one thousand, one hundred ninety-seven".