28196287 has 8 divisors (see below), whose sum is σ = 32910336. Its totient is φ = 23653752.

The previous prime is 28196281. The next prime is 28196291. The reversal of 28196287 is 78269182.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28196287 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 (28196281) 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, 42523 + ... + 43180.

It is an arithmetic number, because the mean of its divisors is an integer number (4113792).

Almost surely, 2^28196287 is an apocalyptic number.

28196287 is a deficient number, since it is larger than the sum of its proper divisors (4714049).

28196287 is an equidigital number, since it uses as much as digits as its factorization.

28196287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85757.

The product of its digits is 96768, while the sum is 43.

The square root of 28196287 is about 5310.0176082571. The cubic root of 28196287 is about 304.3668204439.

The spelling of 28196287 in words is "twenty-eight million, one hundred ninety-six thousand, two hundred eighty-seven".