28207501 has 8 divisors (see below), whose sum is σ = 32845824. Its totient is φ = 23721360.

The previous prime is 28207481. The next prime is 28207507. The reversal of 28207501 is 10570282.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28207501 - 2⁷ = 28207373 is a prime.

It is a super-2 number, since 2×28207501² = 1591326225330002, 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 (28207507) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37645 + ... + 38386.

It is an arithmetic number, because the mean of its divisors is an integer number (4105728).

Almost surely, 2^28207501 is an apocalyptic number.

It is an amenable number.

28207501 is a deficient number, since it is larger than the sum of its proper divisors (4638323).

28207501 is an equidigital number, since it uses as much as digits as its factorization.

28207501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76091.

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 28207501 is about 5311.0734319909. The cubic root of 28207501 is about 304.4071652021.

Adding to 28207501 its reverse (10570282), we get a palindrome (38777783).

The spelling of 28207501 in words is "twenty-eight million, two hundred seven thousand, five hundred one".