28256501 has 8 divisors (see below), whose sum is σ = 34777344. Its totient is φ = 22356720.

The previous prime is 28256497. The next prime is 28256507. The reversal of 28256501 is 10565282.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28256501 - 2² = 28256497 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28256507) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 155165 + ... + 155346.

It is an arithmetic number, because the mean of its divisors is an integer number (4347168).

Almost surely, 2^28256501 is an apocalyptic number.

It is an amenable number.

28256501 is a deficient number, since it is larger than the sum of its proper divisors (6520843).

28256501 is a wasteful number, since it uses less digits than its factorization.

28256501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310531.

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 28256501 is about 5315.6844338241. The cubic root of 28256501 is about 304.5833278294.

The spelling of 28256501 in words is "twenty-eight million, two hundred fifty-six thousand, five hundred one".