28209364 has 6 divisors (see below), whose sum is σ = 49366394. Its totient is φ = 14104680.

The previous prime is 28209359. The next prime is 28209397. The reversal of 28209364 is 46390282.

It can be written as a sum of positive squares in only one way, i.e., 24088464 + 4120900 = 4908^2 + 2030^2 .

It is a congruent number.

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 as a sum of consecutive naturals, namely, 3526167 + ... + 3526174.

Almost surely, 2^28209364 is an apocalyptic number.

It is an amenable number.

28209364 is a deficient number, since it is larger than the sum of its proper divisors (21157030).

28209364 is a wasteful number, since it uses less digits than its factorization.

28209364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7052345 (or 7052343 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 28209364 is about 5311.2488173687. The cubic root of 28209364 is about 304.4138667063.

The spelling of 28209364 in words is "twenty-eight million, two hundred nine thousand, three hundred sixty-four".