28550000 has 60 divisors (see below), whose sum is σ = 69261192. Its totient is φ = 11400000.

The previous prime is 28549957. The next prime is 28550057. The reversal of 28550000 is 5582.

It is a hoax number, since the sum of its digits (20) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 49715 + ... + 50285.

Almost surely, 2^28550000 is an apocalyptic number.

28550000 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 28550000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34630596).

28550000 is an abundant number, since it is smaller than the sum of its proper divisors (40711192).

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

28550000 is an frugal number, since it uses more digits than its factorization.

28550000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 604 (or 578 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 28550000 is about 5343.2200029570. The cubic root of 28550000 is about 305.6342619408.

Adding to 28550000 its reverse (5582), we get a palindrome (28555582).

The spelling of 28550000 in words is "twenty-eight million, five hundred fifty thousand".