28015000 has 80 divisors (see below), whose sum is σ = 70852320. Its totient is φ = 10320000.

The previous prime is 28014953. The next prime is 28015003. The reversal of 28015000 is 51082.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28015003) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 64785 + ... + 65215.

It is an arithmetic number, because the mean of its divisors is an integer number (885654).

Almost surely, 2^28015000 is an apocalyptic number.

28015000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28015000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35426160).

28015000 is an abundant number, since it is smaller than the sum of its proper divisors (42837320).

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

28015000 is a wasteful number, since it uses less digits than its factorization.

28015000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 470 (or 451 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 28015000 is about 5292.9197991279. The cubic root of 28015000 is about 303.7131123105.

Adding to 28015000 its reverse (51082), we get a palindrome (28066082).

The spelling of 28015000 in words is "twenty-eight million, fifteen thousand".