28647296 has 32 divisors (see below), whose sum is σ = 57813600. Its totient is φ = 14137344.

The previous prime is 28647221. The next prime is 28647341. The reversal of 28647296 is 69274682.

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×28647296² = 1641335136223232, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8696 + ... + 11528.

It is an arithmetic number, because the mean of its divisors is an integer number (1806675).

Almost surely, 2^28647296 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 28647296, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28906800).

28647296 is an abundant number, since it is smaller than the sum of its proper divisors (29166304).

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

28647296 is an equidigital number, since it uses as much as digits as its factorization.

28647296 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2926 (or 2914 counting only the distinct ones).

The product of its digits is 290304, while the sum is 44.

The square root of 28647296 is about 5352.3168815009. The cubic root of 28647296 is about 305.9810602429.

The spelling of 28647296 in words is "twenty-eight million, six hundred forty-seven thousand, two hundred ninety-six".