28232501 has 4 divisors (see below), whose sum is σ = 30799104. Its totient is φ = 25665900.

The previous prime is 28232497. The next prime is 28232513. The reversal of 28232501 is 10523282.

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 28232501 - 2² = 28232497 is a prime.

It is a super-2 number, since 2×28232501² = 1594148225430002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28232521) 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, 1283285 + ... + 1283306.

It is an arithmetic number, because the mean of its divisors is an integer number (7699776).

Almost surely, 2^28232501 is an apocalyptic number.

It is an amenable number.

28232501 is a deficient number, since it is larger than the sum of its proper divisors (2566603).

28232501 is a wasteful number, since it uses less digits than its factorization.

28232501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2566602.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 28232501 is about 5313.4264839179. The cubic root of 28232501 is about 304.4970695620.

Adding to 28232501 its reverse (10523282), we get a palindrome (38755783).

The spelling of 28232501 in words is "twenty-eight million, two hundred thirty-two thousand, five hundred one".