28204646 has 24 divisors (see below), whose sum is σ = 44977680. Its totient is φ = 13248816.

The previous prime is 28204643. The next prime is 28204651. The reversal of 28204646 is 64640282.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28204643) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 107111 + ... + 107373.

It is an arithmetic number, because the mean of its divisors is an integer number (1874070).

Almost surely, 2^28204646 is an apocalyptic number.

28204646 is a deficient number, since it is larger than the sum of its proper divisors (16773034).

28204646 is a wasteful number, since it uses less digits than its factorization.

28204646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380 (or 337 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 32.

The square root of 28204646 is about 5310.8046471321. The cubic root of 28204646 is about 304.3968947451.

The spelling of 28204646 in words is "twenty-eight million, two hundred four thousand, six hundred forty-six".