28947407 has 8 divisors (see below), whose sum is σ = 29245440. Its totient is φ = 28651320.

The previous prime is 28947403. The next prime is 28947421. The reversal of 28947407 is 70474982.

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 28947407 - 2² = 28947403 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 (28947403) 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, 60194 + ... + 60672.

It is an arithmetic number, because the mean of its divisors is an integer number (3655680).

Almost surely, 2^28947407 is an apocalyptic number.

28947407 is a deficient number, since it is larger than the sum of its proper divisors (298033).

28947407 is a wasteful number, since it uses less digits than its factorization.

28947407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 973.

The product of its (nonzero) digits is 112896, while the sum is 41.

The square root of 28947407 is about 5380.2794537087. The cubic root of 28947407 is about 307.0458433310.

It can be divided in two parts, 2894 and 7407, that added together give a palindrome (10301).

The spelling of 28947407 in words is "twenty-eight million, nine hundred forty-seven thousand, four hundred seven".