28166667 has 8 divisors (see below), whose sum is σ = 37618896. Its totient is φ = 18746112.

The previous prime is 28166653. The next prime is 28166681. The reversal of 28166667 is 76666182.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28166653) and next prime (28166681).

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

It is a de Polignac number, because none of the positive numbers 2^k-28166667 is a prime.

It is a super-2 number, since 2×28166667² = 1586722259777778, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28166647) 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, 5758 + ... + 9459.

It is an arithmetic number, because the mean of its divisors is an integer number (4702362).

Almost surely, 2^28166667 is an apocalyptic number.

28166667 is a deficient number, since it is larger than the sum of its proper divisors (9452229).

28166667 is a wasteful number, since it uses less digits than its factorization.

28166667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15837.

The product of its digits is 145152, while the sum is 42.

The square root of 28166667 is about 5307.2278074339. The cubic root of 28166667 is about 304.2602047050.

The spelling of 28166667 in words is "twenty-eight million, one hundred sixty-six thousand, six hundred sixty-seven".