28350000 has 300 divisors, whose sum is σ = 117211248. Its totient is φ = 6480000.

The previous prime is 28349989. The next prime is 28350013. The reversal of 28350000 is 5382.

It is a tau number, because it is divible by the number of its divisors (300).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 4049997 + ... + 4050003.

Almost surely, 2^28350000 is an apocalyptic number.

28350000 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 28350000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (58605624).

28350000 is an abundant number, since it is smaller than the sum of its proper divisors (88861248).

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

28350000 is an frugal number, since it uses more digits than its factorization.

28350000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52 (or 17 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 28350000 is about 5324.4718047897. The cubic root of 28350000 is about 304.9189070445.

Adding to 28350000 its reverse (5382), we get a palindrome (28355382).

The spelling of 28350000 in words is "twenty-eight million, three hundred fifty thousand".