28700007 has 8 divisors (see below), whose sum is σ = 43733376. Its totient is φ = 16399992.

The previous prime is 28699997. The next prime is 28700081. The reversal of 28700007 is 70000782.

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

It is not a de Polignac number, because 28700007 - 2⁶ = 28699943 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28700007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28700107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 683313 + ... + 683354.

It is an arithmetic number, because the mean of its divisors is an integer number (5466672).

Almost surely, 2^28700007 is an apocalyptic number.

28700007 is a deficient number, since it is larger than the sum of its proper divisors (15033369).

28700007 is a wasteful number, since it uses less digits than its factorization.

28700007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1366677.

The product of its (nonzero) digits is 784, while the sum is 24.

The square root of 28700007 is about 5357.2387477132. The cubic root of 28700007 is about 306.1686135531.

Adding to 28700007 its reverse (70000782), we get a palindrome (98700789).

The spelling of 28700007 in words is "twenty-eight million, seven hundred thousand, seven".