2297728 has 32 divisors (see below), whose sum is σ = 4743000. Its totient is φ = 1107456.

The previous prime is 2297719. The next prime is 2297731. The reversal of 2297728 is 8277922.

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

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, 3403 + ... + 4021.

2^2297728 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 2297728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2371500).

2297728 is an abundant number, since it is smaller than the sum of its proper divisors (2445272).

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

2297728 is an equidigital number, since it uses as much as digits as its factorization.

2297728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 662 (or 650 counting only the distinct ones).

The product of its digits is 28224, while the sum is 37.

The square root of 2297728 is about 1515.8258475168. The cubic root of 2297728 is about 131.9571333105.

It can be divided in two parts, 22977 and 28, that added together give a triangular number (23005 = T₂₁₄).

The spelling of 2297728 in words is "two million, two hundred ninety-seven thousand, seven hundred twenty-eight".