28199143 has 8 divisors (see below), whose sum is σ = 33098912. Its totient is φ = 23517216.

The previous prime is 28199137. The next prime is 28199153. The reversal of 28199143 is 34199182.

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-28199143 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28199113) 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, 54180 + ... + 54697.

It is an arithmetic number, because the mean of its divisors is an integer number (4137364).

Almost surely, 2^28199143 is an apocalyptic number.

28199143 is a deficient number, since it is larger than the sum of its proper divisors (4899769).

28199143 is a wasteful number, since it uses less digits than its factorization.

28199143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108921.

The product of its digits is 15552, while the sum is 37.

The square root of 28199143 is about 5310.2865271094. The cubic root of 28199143 is about 304.3770965285.

The spelling of 28199143 in words is "twenty-eight million, one hundred ninety-nine thousand, one hundred forty-three".