28500007 has 4 divisors (see below), whose sum is σ = 30176496. Its totient is φ = 26823520.

The previous prime is 28499971. The next prime is 28500023. The reversal of 28500007 is 70000582.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28500007 - 2¹⁵ = 28467239 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28500047) 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, 838219 + ... + 838252.

It is an arithmetic number, because the mean of its divisors is an integer number (7544124).

Almost surely, 2^28500007 is an apocalyptic number.

28500007 is a deficient number, since it is larger than the sum of its proper divisors (1676489).

28500007 is a wasteful number, since it uses less digits than its factorization.

28500007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1676488.

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 28500007 is about 5338.5397816257. The cubic root of 28500007 is about 305.4557622226.

Adding to 28500007 its reverse (70000582), we get a palindrome (98500589).

The spelling of 28500007 in words is "twenty-eight million, five hundred thousand, seven".