28642864 has 40 divisors (see below), whose sum is σ = 56982960. Its totient is φ = 13943808.

The previous prime is 28642837. The next prime is 28642871. The reversal of 28642864 is 46824682.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

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 7 ways as a sum of consecutive naturals, for example, 159927 + ... + 160105.

It is an arithmetic number, because the mean of its divisors is an integer number (1424574).

Almost surely, 2^28642864 is an apocalyptic number.

It is an amenable number.

28642864 is a deficient number, since it is larger than the sum of its proper divisors (28340096).

28642864 is a wasteful number, since it uses less digits than its factorization.

28642864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397 (or 391 counting only the distinct ones).

The product of its digits is 147456, while the sum is 40.

The square root of 28642864 is about 5351.9028391779. The cubic root of 28642864 is about 305.9652800683.

The spelling of 28642864 in words is "twenty-eight million, six hundred forty-two thousand, eight hundred sixty-four".