28836505 has 32 divisors (see below), whose sum is σ = 38561184. Its totient is φ = 20606976.

The previous prime is 28836499. The next prime is 28836517. The reversal of 28836505 is 50563882.

It can be written as a sum of positive squares in 16 ways, for example, as 1993744 + 26842761 = 1412^2 + 5181^2 .

It is a cyclic number.

It is not a de Polignac number, because 28836505 - 2³ = 28836497 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 166599 + ... + 166771.

It is an arithmetic number, because the mean of its divisors is an integer number (1205037).

Almost surely, 2^28836505 is an apocalyptic number.

It is an amenable number.

28836505 is a deficient number, since it is larger than the sum of its proper divisors (9724679).

28836505 is a wasteful number, since it uses less digits than its factorization.

28836505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285.

The product of its (nonzero) digits is 57600, while the sum is 37.

The square root of 28836505 is about 5369.9632214755. The cubic root of 28836505 is about 306.6532281183.

The spelling of 28836505 in words is "twenty-eight million, eight hundred thirty-six thousand, five hundred five".