28201998 has 32 divisors (see below), whose sum is σ = 62000640. Its totient is φ = 8480960.

The previous prime is 28201993. The next prime is 28202011. The reversal of 28201998 is 89910282.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28201993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7483 + ... + 10601.

It is an arithmetic number, because the mean of its divisors is an integer number (1937520).

Almost surely, 2^28201998 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28201998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31000320).

28201998 is an abundant number, since it is smaller than the sum of its proper divisors (33798642).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28201998 is a wasteful number, since it uses less digits than its factorization.

28201998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3272.

The product of its (nonzero) digits is 20736, while the sum is 39.

The square root of 28201998 is about 5310.5553381920. Note that the first 3 decimals coincide. The cubic root of 28201998 is about 304.3873683216.

The spelling of 28201998 in words is "twenty-eight million, two hundred one thousand, nine hundred ninety-eight".