28007507 has 12 divisors (see below), whose sum is σ = 30959208. Its totient is φ = 25317600.

The previous prime is 28007503. The next prime is 28007509. The reversal of 28007507 is 70570082.

It is not a de Polignac number, because 28007507 - 2² = 28007503 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28007507.

It is not an unprimeable number, because it can be changed into a prime (28007503) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24983 + ... + 26079.

It is an arithmetic number, because the mean of its divisors is an integer number (2579934).

Almost surely, 2^28007507 is an apocalyptic number.

28007507 is a deficient number, since it is larger than the sum of its proper divisors (2951701).

28007507 is a wasteful number, since it uses less digits than its factorization.

28007507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1330 (or 1319 counting only the distinct ones).

The product of its (nonzero) digits is 3920, while the sum is 29.

The square root of 28007507 is about 5292.2119194152. The cubic root of 28007507 is about 303.6860324691.

Adding to 28007507 its reverse (70570082), we get a palindrome (98577589).

The spelling of 28007507 in words is "twenty-eight million, seven thousand, five hundred seven".