28343690 has 8 divisors (see below), whose sum is σ = 51018660. Its totient is φ = 11337472.

The previous prime is 28343683. The next prime is 28343717. The reversal of 28343690 is 9634382.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 24910081 + 3433609 = 4991^2 + 1853^2 .

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

It is a super-2 number, since 2×28343690² = 1606729525632200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28343690.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1417175 + ... + 1417194.

Almost surely, 2^28343690 is an apocalyptic number.

28343690 is a deficient number, since it is larger than the sum of its proper divisors (22674970).

28343690 is a wasteful number, since it uses less digits than its factorization.

28343690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2834376.

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 28343690 is about 5323.8792247759. The cubic root of 28343690 is about 304.8962829284.

The spelling of 28343690 in words is "twenty-eight million, three hundred forty-three thousand, six hundred ninety".