28290501 has 6 divisors (see below), whose sum is σ = 40864070. Its totient is φ = 18860328.

The previous prime is 28290463. The next prime is 28290511. The reversal of 28290501 is 10509282.

It can be written as a sum of positive squares in only one way, i.e., 21399876 + 6890625 = 4626^2 + 2625^2 .

It is a de Polignac number, because none of the positive numbers 2^k-28290501 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 (28290511) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1571686 + ... + 1571703.

Almost surely, 2^28290501 is an apocalyptic number.

It is an amenable number.

28290501 is a deficient number, since it is larger than the sum of its proper divisors (12573569).

28290501 is a wasteful number, since it uses less digits than its factorization.

28290501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3143395 (or 3143392 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 28290501 is about 5318.8815553648. The cubic root of 28290501 is about 304.7054434719.

Adding to 28290501 its reverse (10509282), we get a palindrome (38799783).

The spelling of 28290501 in words is "twenty-eight million, two hundred ninety thousand, five hundred one".