28813000 has 32 divisors (see below), whose sum is σ = 67424760. Its totient is φ = 11524800.

The previous prime is 28812989. The next prime is 28813003. The reversal of 28813000 is 31882.

It can be written as a sum of positive squares in 4 ways, for example, as 4072324 + 24740676 = 2018^2 + 4974^2 .

It is not an unprimeable number, because it can be changed into a prime (28813003) 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, 13407 + ... + 15406.

Almost surely, 2^28813000 is an apocalyptic number.

28813000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28813000 is an abundant number, since it is smaller than the sum of its proper divisors (38611760).

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

28813000 is a wasteful number, since it uses less digits than its factorization.

28813000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28834 (or 28820 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 28813000 is about 5367.7742128372. The cubic root of 28813000 is about 306.5698864948.

Adding to 28813000 its reverse (31882), we get a palindrome (28844882).

The spelling of 28813000 in words is "twenty-eight million, eight hundred thirteen thousand".