28607231 has 8 divisors (see below), whose sum is σ = 29248128. Its totient is φ = 27972000.

The previous prime is 28607219. The next prime is 28607233. The reversal of 28607231 is 13270682.

28607231 = T₁₉₈ + T₁₉₉ + ... + T₅₆₃.

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-28607231 is a prime.

It is a super-2 number, since 2×28607231² = 1636747330974722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28607194 and 28607203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28607233) 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, 9746 + ... + 12336.

It is an arithmetic number, because the mean of its divisors is an integer number (3656016).

Almost surely, 2^28607231 is an apocalyptic number.

28607231 is a deficient number, since it is larger than the sum of its proper divisors (640897).

28607231 is a wasteful number, since it uses less digits than its factorization.

28607231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2833.

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

The square root of 28607231 is about 5348.5728002898. The cubic root of 28607231 is about 305.8383492674.

The spelling of 28607231 in words is "twenty-eight million, six hundred seven thousand, two hundred thirty-one".