28087400 has 96 divisors (see below), whose sum is σ = 75530880. Its totient is φ = 9600000.

The previous prime is 28087373. The next prime is 28087429. The reversal of 28087400 is 478082.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37025 + ... + 37775.

It is an arithmetic number, because the mean of its divisors is an integer number (786780).

Almost surely, 2^28087400 is an apocalyptic number.

28087400 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 28087400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37765440).

28087400 is an abundant number, since it is smaller than the sum of its proper divisors (47443480).

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

28087400 is a wasteful number, since it uses less digits than its factorization.

28087400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 795 (or 786 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 29.

The square root of 28087400 is about 5299.7547113050. The cubic root of 28087400 is about 303.9745188707.

The spelling of 28087400 in words is "twenty-eight million, eighty-seven thousand, four hundred".