28591900 has 36 divisors (see below), whose sum is σ = 62527248. Its totient is φ = 11347840.

The previous prime is 28591897. The next prime is 28591907. The reversal of 28591900 is 919582.

It is a super-2 number, since 2×28591900² = 1634993491220000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28591907) 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, 12657 + ... + 14743.

It is an arithmetic number, because the mean of its divisors is an integer number (1736868).

Almost surely, 2^28591900 is an apocalyptic number.

28591900 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 28591900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31263624).

28591900 is an abundant number, since it is smaller than the sum of its proper divisors (33935348).

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

28591900 is a wasteful number, since it uses less digits than its factorization.

28591900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2238 (or 2231 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 34.

The square root of 28591900 is about 5347.1394221584. The cubic root of 28591900 is about 305.7837052093.

The spelling of 28591900 in words is "twenty-eight million, five hundred ninety-one thousand, nine hundred".