28281998 has 16 divisors (see below), whose sum is σ = 43338240. Its totient is φ = 13839000.

The previous prime is 28281991. The next prime is 28282021. The reversal of 28281998 is 89918282.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28281991) 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, 20783 + ... + 22101.

It is an arithmetic number, because the mean of its divisors is an integer number (2708640).

Almost surely, 2^28281998 is an apocalyptic number.

28281998 is a deficient number, since it is larger than the sum of its proper divisors (15056242).

28281998 is a wasteful number, since it uses less digits than its factorization.

28281998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1543.

The product of its digits is 165888, while the sum is 47.

The square root of 28281998 is about 5318.0821731147. The cubic root of 28281998 is about 304.6749129650.

The spelling of 28281998 in words is "twenty-eight million, two hundred eighty-one thousand, nine hundred ninety-eight".