28753505 has 24 divisors (see below), whose sum is σ = 38705472. Its totient is φ = 20336000.

The previous prime is 28753499. The next prime is 28753531. The reversal of 28753505 is 50535782.

It is not a de Polignac number, because 28753505 - 2⁴ = 28753489 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 92300 + ... + 92610.

It is an arithmetic number, because the mean of its divisors is an integer number (1612728).

Almost surely, 2^28753505 is an apocalyptic number.

It is an amenable number.

28753505 is a deficient number, since it is larger than the sum of its proper divisors (9951967).

28753505 is a wasteful number, since it uses less digits than its factorization.

28753505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409 (or 368 counting only the distinct ones).

The product of its (nonzero) digits is 42000, while the sum is 35.

The square root of 28753505 is about 5362.2294803561. The cubic root of 28753505 is about 306.3587324582.

The spelling of 28753505 in words is "twenty-eight million, seven hundred fifty-three thousand, five hundred five".