28057664 has 14 divisors (see below), whose sum is σ = 55677054. Its totient is φ = 14028800.

The previous prime is 28057643. The next prime is 28057681. The reversal of 28057664 is 46675082.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 19009600 + 9048064 = 4360^2 + 3008^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 219137 + ... + 219264.

Almost surely, 2^28057664 is an apocalyptic number.

It is an amenable number.

28057664 is a deficient number, since it is larger than the sum of its proper divisors (27619390).

28057664 is an equidigital number, since it uses as much as digits as its factorization.

28057664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438413 (or 438403 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 38.

The square root of 28057664 is about 5296.9485555365. The cubic root of 28057664 is about 303.8672088549.

The spelling of 28057664 in words is "twenty-eight million, fifty-seven thousand, six hundred sixty-four".