28343237 has 8 divisors (see below), whose sum is σ = 31576440. Its totient is φ = 25260480.

The previous prime is 28343219. The next prime is 28343239. The reversal of 28343237 is 73234382.

It can be written as a sum of positive squares in 4 ways, for example, as 1985281 + 26357956 = 1409^2 + 5134^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28343237 - 2²⁴ = 11566021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28343239) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37214 + ... + 37967.

It is an arithmetic number, because the mean of its divisors is an integer number (3947055).

Almost surely, 2^28343237 is an apocalyptic number.

It is an amenable number.

28343237 is a deficient number, since it is larger than the sum of its proper divisors (3233203).

28343237 is a wasteful number, since it uses less digits than its factorization.

28343237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75223.

The product of its digits is 24192, while the sum is 32.

The square root of 28343237 is about 5323.8366804402. The cubic root of 28343237 is about 304.8946585957.

The spelling of 28343237 in words is "twenty-eight million, three hundred forty-three thousand, two hundred thirty-seven".