28504501 has 2 divisors, whose sum is σ = 28504502. Its totient is φ = 28504500.

The previous prime is 28504499. The next prime is 28504519. The reversal of 28504501 is 10540582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26471025 + 2033476 = 5145^2 + 1426^2 .

It is a cyclic number.

It is not a de Polignac number, because 28504501 - 2¹ = 28504499 is a prime.

Together with 28504499, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28504001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14252250 + 14252251.

It is an arithmetic number, because the mean of its divisors is an integer number (14252251).

Almost surely, 2^28504501 is an apocalyptic number.

It is an amenable number.

28504501 is a deficient number, since it is larger than the sum of its proper divisors (1).

28504501 is an equidigital number, since it uses as much as digits as its factorization.

28504501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1600, while the sum is 25.

The square root of 28504501 is about 5338.9606666466. The cubic root of 28504501 is about 305.4718165584.

The spelling of 28504501 in words is "twenty-eight million, five hundred four thousand, five hundred one".