28117407 has 8 divisors (see below), whose sum is σ = 37537920. Its totient is φ = 18720920.

The previous prime is 28117391. The next prime is 28117409. The reversal of 28117407 is 70471182.

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 28117407 - 2⁴ = 28117391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28117409) 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, 3069 + ... + 8102.

It is an arithmetic number, because the mean of its divisors is an integer number (4692240).

Almost surely, 2^28117407 is an apocalyptic number.

28117407 is a deficient number, since it is larger than the sum of its proper divisors (9420513).

28117407 is a wasteful number, since it uses less digits than its factorization.

28117407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12013.

The product of its (nonzero) digits is 3136, while the sum is 30.

The square root of 28117407 is about 5302.5849356705. The cubic root of 28117407 is about 304.0827301097.

Adding to 28117407 its reverse (70471182), we get a palindrome (98588589).

The spelling of 28117407 in words is "twenty-eight million, one hundred seventeen thousand, four hundred seven".