28402197 has 4 divisors (see below), whose sum is σ = 37869600. Its totient is φ = 18934796.

The previous prime is 28402177. The next prime is 28402219. The reversal of 28402197 is 79120482.

It is a happy number.

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 28402197 - 2⁶ = 28402133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28402177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4733697 + ... + 4733702.

It is an arithmetic number, because the mean of its divisors is an integer number (9467400).

Almost surely, 2^28402197 is an apocalyptic number.

It is an amenable number.

28402197 is a deficient number, since it is larger than the sum of its proper divisors (9467403).

28402197 is an equidigital number, since it uses as much as digits as its factorization.

28402197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9467402.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 28402197 is about 5329.3711636552. The cubic root of 28402197 is about 305.1059275532.

The spelling of 28402197 in words is "twenty-eight million, four hundred two thousand, one hundred ninety-seven".