28506667 has 8 divisors (see below), whose sum is σ = 32612096. Its totient is φ = 24409512.

The previous prime is 28506649. The next prime is 28506677. The reversal of 28506667 is 76660582.

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 28506667 - 2¹⁵ = 28473899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28506677) 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, 10138 + ... + 12640.

It is an arithmetic number, because the mean of its divisors is an integer number (4076512).

Almost surely, 2^28506667 is an apocalyptic number.

28506667 is a deficient number, since it is larger than the sum of its proper divisors (4105429).

28506667 is a wasteful number, since it uses less digits than its factorization.

28506667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4137.

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 28506667 is about 5339.1635112628. The cubic root of 28506667 is about 305.4795537598.

The spelling of 28506667 in words is "twenty-eight million, five hundred six thousand, six hundred sixty-seven".