28087830 has 64 divisors (see below), whose sum is σ = 78174720. Its totient is φ = 7162848.

The previous prime is 28087823. The next prime is 28087831. The reversal of 28087830 is 3878082.

It is a super-3 number, since 3×28087830³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28087831) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3949 + ... + 8471.

It is an arithmetic number, because the mean of its divisors is an integer number (1221480).

Almost surely, 2^28087830 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28087830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39087360).

28087830 is an abundant number, since it is smaller than the sum of its proper divisors (50086890).

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

28087830 is a wasteful number, since it uses less digits than its factorization.

28087830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4562 (or 4556 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 28087830 is about 5299.7952790650. The cubic root of 28087830 is about 303.9760700808.

The spelling of 28087830 in words is "twenty-eight million, eighty-seven thousand, eight hundred thirty".