28272407 has 4 divisors (see below), whose sum is σ = 28290240. Its totient is φ = 28254576.

The previous prime is 28272401. The next prime is 28272443. The reversal of 28272407 is 70427282.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70427282 = 2 ⋅35213641.

It is a cyclic number.

It is not a de Polignac number, because 28272407 - 2¹⁸ = 28010263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28272401) 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, 6278 + ... + 9795.

It is an arithmetic number, because the mean of its divisors is an integer number (7072560).

Almost surely, 2^28272407 is an apocalyptic number.

28272407 is a deficient number, since it is larger than the sum of its proper divisors (17833).

28272407 is a wasteful number, since it uses less digits than its factorization.

28272407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17832.

The product of its (nonzero) digits is 12544, while the sum is 32.

The square root of 28272407 is about 5317.1803618083. The cubic root of 28272407 is about 304.6404685872.

Adding to 28272407 its reverse (70427282), we get a palindrome (98699689).

The spelling of 28272407 in words is "twenty-eight million, two hundred seventy-two thousand, four hundred seven".