28252501 has 4 divisors (see below), whose sum is σ = 29163904. Its totient is φ = 27341100.

The previous prime is 28252489. The next prime is 28252507. The reversal of 28252501 is 10525282.

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 28252501 - 2¹³ = 28244309 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 (28252507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 455655 + ... + 455716.

It is an arithmetic number, because the mean of its divisors is an integer number (7290976).

Almost surely, 2^28252501 is an apocalyptic number.

It is an amenable number.

28252501 is a deficient number, since it is larger than the sum of its proper divisors (911403).

28252501 is an equidigital number, since it uses as much as digits as its factorization.

28252501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 911402.

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

The square root of 28252501 is about 5315.3081754495. The cubic root of 28252501 is about 304.5689548442.

Adding to 28252501 its reverse (10525282), we get a palindrome (38777783).

The spelling of 28252501 in words is "twenty-eight million, two hundred fifty-two thousand, five hundred one".