28191456 has 96 divisors (see below), whose sum is σ = 83623680. Its totient is φ = 9237888.

The previous prime is 28191413. The next prime is 28191463. The reversal of 28191456 is 65419182.

It is a tau number, because it is divible by the number of its divisors (96).

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

It is a self number, because there is not a number n which added to its sum of digits gives 28191456.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57645 + ... + 58131.

It is an arithmetic number, because the mean of its divisors is an integer number (871080).

Almost surely, 2^28191456 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 28191456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41811840).

28191456 is an abundant number, since it is smaller than the sum of its proper divisors (55432224).

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

28191456 is a wasteful number, since it uses less digits than its factorization.

28191456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 573 (or 559 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 28191456 is about 5309.5626938572. The cubic root of 28191456 is about 304.3494365937.

The spelling of 28191456 in words is "twenty-eight million, one hundred ninety-one thousand, four hundred fifty-six".