28644136 has 32 divisors (see below), whose sum is σ = 55353600. Its totient is φ = 13890240.

The previous prime is 28644113. The next prime is 28644137. The reversal of 28644136 is 63144682.

It is not an unprimeable number, because it can be changed into a prime (28644137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38181 + ... + 38923.

It is an arithmetic number, because the mean of its divisors is an integer number (1729800).

Almost surely, 2^28644136 is an apocalyptic number.

It is an amenable number.

28644136 is a deficient number, since it is larger than the sum of its proper divisors (26709464).

28644136 is a wasteful number, since it uses less digits than its factorization.

28644136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 889 (or 885 counting only the distinct ones).

The product of its digits is 27648, while the sum is 34.

The square root of 28644136 is about 5352.0216740966. The cubic root of 28644136 is about 305.9698092019.

The spelling of 28644136 in words is "twenty-eight million, six hundred forty-four thousand, one hundred thirty-six".