28150400 has 96 divisors (see below), whose sum is σ = 73358400. Its totient is φ = 10644480.

The previous prime is 28150357. The next prime is 28150469. The reversal of 28150400 is 405182.

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

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, 60569 + ... + 61031.

It is an arithmetic number, because the mean of its divisors is an integer number (764150).

Almost surely, 2^28150400 is an apocalyptic number.

28150400 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 28150400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36679200).

28150400 is an abundant number, since it is smaller than the sum of its proper divisors (45208000).

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

28150400 is a wasteful number, since it uses less digits than its factorization.

28150400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506 (or 489 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 28150400 is about 5305.6950534308. The cubic root of 28150400 is about 304.2016206364.

Adding to 28150400 its reverse (405182), we get a palindrome (28555582).

The spelling of 28150400 in words is "twenty-eight million, one hundred fifty thousand, four hundred".