28717667 has 8 divisors (see below), whose sum is σ = 31371312. Its totient is φ = 26071200.

The previous prime is 28717657. The next prime is 28717681. The reversal of 28717667 is 76671782.

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 28717667 - 2⁴ = 28717651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28717657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9953 + ... + 12509.

It is an arithmetic number, because the mean of its divisors is an integer number (3921414).

Almost surely, 2^28717667 is an apocalyptic number.

28717667 is a deficient number, since it is larger than the sum of its proper divisors (2653645).

28717667 is a wasteful number, since it uses less digits than its factorization.

28717667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3589.

The product of its digits is 197568, while the sum is 44.

The square root of 28717667 is about 5358.8867314023. The cubic root of 28717667 is about 306.2313990091.

The spelling of 28717667 in words is "twenty-eight million, seven hundred seventeen thousand, six hundred sixty-seven".