28005700 has 36 divisors (see below), whose sum is σ = 61384960. Its totient is φ = 11089440.

The previous prime is 28005683. The next prime is 28005701. The reversal of 28005700 is 750082.

It is not an unprimeable number, because it can be changed into a prime (28005701) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8941 + ... + 11659.

Almost surely, 2^28005700 is an apocalyptic number.

28005700 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 28005700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30692480).

28005700 is an abundant number, since it is smaller than the sum of its proper divisors (33379260).

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

28005700 is a wasteful number, since it uses less digits than its factorization.

28005700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2836 (or 2829 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 28005700 is about 5292.0411940951. The cubic root of 28005700 is about 303.6795012147.

Adding to 28005700 its reverse (750082), we get a palindrome (28755782).

The spelling of 28005700 in words is "twenty-eight million, five thousand, seven hundred".