28087164 has 72 divisors (see below), whose sum is σ = 81664128. Its totient is φ = 7973280.

The previous prime is 28087159. The next prime is 28087177. The reversal of 28087164 is 46178082.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 56959 + ... + 57449.

It is an arithmetic number, because the mean of its divisors is an integer number (1134224).

Almost surely, 2^28087164 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28087164, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40832064).

28087164 is an abundant number, since it is smaller than the sum of its proper divisors (53576964).

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

28087164 is a wasteful number, since it uses less digits than its factorization.

28087164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 735 (or 730 counting only the distinct ones).

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

The square root of 28087164 is about 5299.7324460769. The cubic root of 28087164 is about 303.9736675022.

The spelling of 28087164 in words is "twenty-eight million, eighty-seven thousand, one hundred sixty-four".