28820501 has 4 divisors (see below), whose sum is σ = 28907904. Its totient is φ = 28733100.

The previous prime is 28820471. The next prime is 28820503. The reversal of 28820501 is 10502882.

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.

It is a cyclic number.

It is not a de Polignac number, because 28820501 - 2¹⁰ = 28819477 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 (28820503) 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 3 ways as a sum of consecutive naturals, for example, 43205 + ... + 43866.

It is an arithmetic number, because the mean of its divisors is an integer number (7226976).

Almost surely, 2^28820501 is an apocalyptic number.

It is an amenable number.

28820501 is a deficient number, since it is larger than the sum of its proper divisors (87403).

28820501 is an equidigital number, since it uses as much as digits as its factorization.

28820501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87402.

The product of its (nonzero) digits is 1280, while the sum is 26.

The square root of 28820501 is about 5368.4728741049. The cubic root of 28820501 is about 306.5964876956.

The spelling of 28820501 in words is "twenty-eight million, eight hundred twenty thousand, five hundred one".