28143995 has 16 divisors (see below), whose sum is σ = 37156320. Its totient is φ = 20463520.

The previous prime is 28143971. The next prime is 28144033. The reversal of 28143995 is 59934182.

It is not a de Polignac number, because 28143995 - 2¹⁴ = 28127611 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4541 + ... + 8769.

It is an arithmetic number, because the mean of its divisors is an integer number (2322270).

Almost surely, 2^28143995 is an apocalyptic number.

28143995 is a deficient number, since it is larger than the sum of its proper divisors (9012325).

28143995 is an equidigital number, since it uses as much as digits as its factorization.

28143995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4267 (or 4245 counting only the distinct ones).

The product of its digits is 77760, while the sum is 41.

The square root of 28143995 is about 5305.0914223979. The cubic root of 28143995 is about 304.1785474394.

The spelling of 28143995 in words is "twenty-eight million, one hundred forty-three thousand, nine hundred ninety-five".