28731197 has 8 divisors (see below), whose sum is σ = 31721760. Its totient is φ = 25803760.

The previous prime is 28731191. The next prime is 28731221. The reversal of 28731197 is 79113782.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28731197 - 2⁸ = 28730941 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28731197.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28731191) 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, 14822 + ... + 16647.

It is an arithmetic number, because the mean of its divisors is an integer number (3965220).

Almost surely, 2^28731197 is an apocalyptic number.

It is an amenable number.

28731197 is a deficient number, since it is larger than the sum of its proper divisors (2990563).

28731197 is a wasteful number, since it uses less digits than its factorization.

28731197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31563.

The product of its digits is 21168, while the sum is 38.

The square root of 28731197 is about 5360.1489718104. The cubic root of 28731197 is about 306.2794839308.

The spelling of 28731197 in words is "twenty-eight million, seven hundred thirty-one thousand, one hundred ninety-seven".