28340288 has 14 divisors (see below), whose sum is σ = 56237886. Its totient is φ = 14170112.

The previous prime is 28340251. The next prime is 28340329. The reversal of 28340288 is 88204382.

It can be written as a sum of positive squares in only one way, i.e., 21827584 + 6512704 = 4672^2 + 2552^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221345 + ... + 221472.

Almost surely, 2^28340288 is an apocalyptic number.

It is an amenable number.

28340288 is a deficient number, since it is larger than the sum of its proper divisors (27897598).

28340288 is an equidigital number, since it uses as much as digits as its factorization.

28340288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442829 (or 442819 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 35.

The square root of 28340288 is about 5323.5597113210. The cubic root of 28340288 is about 304.8840838739.

The spelling of 28340288 in words is "twenty-eight million, three hundred forty thousand, two hundred eighty-eight".