28236501 has 6 divisors (see below), whose sum is σ = 40786070. Its totient is φ = 18824328.

The previous prime is 28236493. The next prime is 28236539. The reversal of 28236501 is 10563282.

28236501 is a `hidden beast` number, since 2 + 8 + 2 + 3 + 650 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 28196100 + 40401 = 5310^2 + 201^2 .

It is not a de Polignac number, because 28236501 - 2³ = 28236493 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 (28236581) 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, 1568686 + ... + 1568703.

Almost surely, 2^28236501 is an apocalyptic number.

It is an amenable number.

28236501 is a deficient number, since it is larger than the sum of its proper divisors (12549569).

28236501 is a wasteful number, since it uses less digits than its factorization.

28236501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3137395 (or 3137392 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 28236501 is about 5313.8028755309. The cubic root of 28236501 is about 304.5114493337.

Adding to 28236501 its reverse (10563282), we get a palindrome (38799783).

The spelling of 28236501 in words is "twenty-eight million, two hundred thirty-six thousand, five hundred one".