28012664 has 32 divisors (see below), whose sum is σ = 53902800. Its totient is φ = 13643520.

The previous prime is 28012639. The next prime is 28012667. The reversal of 28012664 is 46621082.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28012667) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 66647 + ... + 67065.

Almost surely, 2^28012664 is an apocalyptic number.

It is an amenable number.

28012664 is a deficient number, since it is larger than the sum of its proper divisors (25890136).

28012664 is a wasteful number, since it uses less digits than its factorization.

28012664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 623 (or 619 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 28012664 is about 5292.6991223760. The cubic root of 28012664 is about 303.7046704811.

The spelling of 28012664 in words is "twenty-eight million, twelve thousand, six hundred sixty-four".