28753501 has 4 divisors (see below), whose sum is σ = 32861152. Its totient is φ = 24645852.

The previous prime is 28753499. The next prime is 28753531. The reversal of 28753501 is 10535782.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10535782 = 2 ⋅5267891.

It is not a de Polignac number, because 28753501 - 2¹ = 28753499 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28753531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2053815 + ... + 2053828.

It is an arithmetic number, because the mean of its divisors is an integer number (8215288).

Almost surely, 2^28753501 is an apocalyptic number.

It is an amenable number.

28753501 is a deficient number, since it is larger than the sum of its proper divisors (4107651).

28753501 is an equidigital number, since it uses as much as digits as its factorization.

28753501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4107650.

The product of its (nonzero) digits is 8400, while the sum is 31.

The square root of 28753501 is about 5362.2291073769. The cubic root of 28753501 is about 306.3587182519.

The spelling of 28753501 in words is "twenty-eight million, seven hundred fifty-three thousand, five hundred one".