28501565 has 8 divisors (see below), whose sum is σ = 34234080. Its totient is φ = 22779792.

The previous prime is 28501553. The next prime is 28501567. The reversal of 28501565 is 56510582.

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 28501565 - 2¹⁰ = 28500541 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28501567) 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, 5342 + ... + 9248.

It is an arithmetic number, because the mean of its divisors is an integer number (4279260).

Almost surely, 2^28501565 is an apocalyptic number.

It is an amenable number.

28501565 is a deficient number, since it is larger than the sum of its proper divisors (5732515).

28501565 is a wasteful number, since it uses less digits than its factorization.

28501565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5371.

The product of its (nonzero) digits is 12000, while the sum is 32.

The square root of 28501565 is about 5338.6856996830. The cubic root of 28501565 is about 305.4613282025.

The spelling of 28501565 in words is "twenty-eight million, five hundred one thousand, five hundred sixty-five".