28231607 has 8 divisors (see below), whose sum is σ = 29821440. Its totient is φ = 26684280.

The previous prime is 28231597. The next prime is 28231613. The reversal of 28231607 is 70613282.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28231607 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28231607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28231627) 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, 9257 + ... + 11922.

It is an arithmetic number, because the mean of its divisors is an integer number (3727680).

Almost surely, 2^28231607 is an apocalyptic number.

28231607 is a deficient number, since it is larger than the sum of its proper divisors (1589833).

28231607 is a wasteful number, since it uses less digits than its factorization.

28231607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21253.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 28231607 is about 5313.3423567468. The cubic root of 28231607 is about 304.4938554973.

Adding to 28231607 its reverse (70613282), we get a palindrome (98844889).

The spelling of 28231607 in words is "twenty-eight million, two hundred thirty-one thousand, six hundred seven".