28656801 has 8 divisors (see below), whose sum is σ = 42454560. Its totient is φ = 19104516.

The previous prime is 28656799. The next prime is 28656809. The reversal of 28656801 is 10865682.

It is a happy number.

It is not a de Polignac number, because 28656801 - 2¹ = 28656799 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28656809) by changing a digit.

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, 530655 + ... + 530708.

It is an arithmetic number, because the mean of its divisors is an integer number (5306820).

Almost surely, 2^28656801 is an apocalyptic number.

It is an amenable number.

28656801 is a deficient number, since it is larger than the sum of its proper divisors (13797759).

28656801 is a wasteful number, since it uses less digits than its factorization.

28656801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1061372 (or 1061366 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 28656801 is about 5353.2047410873. The cubic root of 28656801 is about 306.0148973908.

The spelling of 28656801 in words is "twenty-eight million, six hundred fifty-six thousand, eight hundred one".