28640964 has 48 divisors (see below), whose sum is σ = 74120256. Its totient is φ = 8534400.

The previous prime is 28640947. The next prime is 28640977. The reversal of 28640964 is 46904682.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 6274 + ... + 9830.

It is an arithmetic number, because the mean of its divisors is an integer number (1544172).

Almost surely, 2^28640964 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28640964, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37060128).

28640964 is an abundant number, since it is smaller than the sum of its proper divisors (45479292).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28640964 is a wasteful number, since it uses less digits than its factorization.

28640964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3636 (or 3634 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 39.

The square root of 28640964 is about 5351.7253292747. The cubic root of 28640964 is about 305.9585146032.

The spelling of 28640964 in words is "twenty-eight million, six hundred forty thousand, nine hundred sixty-four".