28571264 has 64 divisors (see below), whose sum is σ = 60588000. Its totient is φ = 13396992.

The previous prime is 28571239. The next prime is 28571287. The reversal of 28571264 is 46217582.

It is a tau number, because it is divible by the number of its divisors (64).

It is an unprimeable number.

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, 159527 + ... + 159705.

Almost surely, 2^28571264 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 28571264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30294000).

28571264 is an abundant number, since it is smaller than the sum of its proper divisors (32016736).

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

28571264 is a wasteful number, since it uses less digits than its factorization.

28571264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265 (or 253 counting only the distinct ones).

The product of its digits is 26880, while the sum is 35.

The square root of 28571264 is about 5345.2094439788. The cubic root of 28571264 is about 305.7101217672.

The spelling of 28571264 in words is "twenty-eight million, five hundred seventy-one thousand, two hundred sixty-four".