28501765 has 8 divisors (see below), whose sum is σ = 35036568. Its totient is φ = 22245120.

The previous prime is 28501727. The next prime is 28501769. The reversal of 28501765 is 56710582.

It can be written as a sum of positive squares in 4 ways, for example, as 263169 + 28238596 = 513^2 + 5314^2 .

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

It is not a de Polignac number, because 28501765 - 2²¹ = 26404613 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28501765.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28501769) by changing a digit.

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, 69312 + ... + 69721.

It is an arithmetic number, because the mean of its divisors is an integer number (4379571).

Almost surely, 2^28501765 is an apocalyptic number.

It is an amenable number.

28501765 is a deficient number, since it is larger than the sum of its proper divisors (6534803).

28501765 is a wasteful number, since it uses less digits than its factorization.

28501765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139079.

The product of its (nonzero) digits is 16800, while the sum is 34.

The square root of 28501765 is about 5338.7044308521. The cubic root of 28501765 is about 305.4620426911.

The spelling of 28501765 in words is "twenty-eight million, five hundred one thousand, seven hundred sixty-five".