28142997 has 8 divisors (see below), whose sum is σ = 37647456. Its totient is φ = 18700272.

The previous prime is 28142981. The next prime is 28143001. The reversal of 28142997 is 79924182.

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

It is not a de Polignac number, because 28142997 - 2⁴ = 28142981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28142797) 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, 14358 + ... + 16199.

It is an arithmetic number, because the mean of its divisors is an integer number (4705932).

Almost surely, 2^28142997 is an apocalyptic number.

It is an amenable number.

28142997 is a deficient number, since it is larger than the sum of its proper divisors (9504459).

28142997 is a wasteful number, since it uses less digits than its factorization.

28142997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30867.

The product of its digits is 72576, while the sum is 42.

The square root of 28142997 is about 5304.9973609796. The cubic root of 28142997 is about 304.1749519563.

The spelling of 28142997 in words is "twenty-eight million, one hundred forty-two thousand, nine hundred ninety-seven".