28638197 has 12 divisors (see below), whose sum is σ = 34763616. Its totient is φ = 23478840.

The previous prime is 28638193. The next prime is 28638209. The reversal of 28638197 is 79183682.

It is not a de Polignac number, because 28638197 - 2² = 28638193 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 (28638191) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11579 + ... + 13832.

It is an arithmetic number, because the mean of its divisors is an integer number (2896968).

Almost surely, 2^28638197 is an apocalyptic number.

It is an amenable number.

28638197 is a deficient number, since it is larger than the sum of its proper divisors (6125419).

28638197 is a wasteful number, since it uses less digits than its factorization.

28638197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25448 (or 25441 counting only the distinct ones).

The product of its digits is 145152, while the sum is 44.

The square root of 28638197 is about 5351.4668082686. The cubic root of 28638197 is about 305.9486614144.

It can be divided in two parts, 286 and 38197, that added together give a palindrome (38483).

The spelling of 28638197 in words is "twenty-eight million, six hundred thirty-eight thousand, one hundred ninety-seven".