28150000 has 60 divisors (see below), whose sum is σ = 68292504. Its totient is φ = 11240000.

The previous prime is 28149973. The next prime is 28150019. The reversal of 28150000 is 5182.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 49719 + ... + 50281.

Almost surely, 2^28150000 is an apocalyptic number.

28150000 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 28150000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34146252).

28150000 is an abundant number, since it is smaller than the sum of its proper divisors (40142504).

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

28150000 is an frugal number, since it uses more digits than its factorization.

28150000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 596 (or 570 counting only the distinct ones).

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

The square root of 28150000 is about 5305.6573579529. The cubic root of 28150000 is about 304.2001797898.

Adding to 28150000 its reverse (5182), we get a palindrome (28155182).

The spelling of 28150000 in words is "twenty-eight million, one hundred fifty thousand".