28130700 has 72 divisors (see below), whose sum is σ = 87664528. Its totient is φ = 6923520.

The previous prime is 28130689. The next prime is 28130701. The reversal of 28130700 is 703182.

It is not an unprimeable number, because it can be changed into a prime (28130701) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 294 + ... + 7506.

Almost surely, 2^28130700 is an apocalyptic number.

28130700 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 28130700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43832264).

28130700 is an abundant number, since it is smaller than the sum of its proper divisors (59533828).

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

28130700 is a wasteful number, since it uses less digits than its factorization.

28130700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7243 (or 7236 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 28130700 is about 5303.8382328272. The cubic root of 28130700 is about 304.1306427177.

Adding to 28130700 its reverse (703182), we get a palindrome (28833882).

The spelling of 28130700 in words is "twenty-eight million, one hundred thirty thousand, seven hundred".