28148667 has 4 divisors (see below), whose sum is σ = 37531560. Its totient is φ = 18765776.

The previous prime is 28148641. The next prime is 28148677. The reversal of 28148667 is 76684182.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28148667 - 2¹⁰ = 28147643 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28148677) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4691442 + ... + 4691447.

It is an arithmetic number, because the mean of its divisors is an integer number (9382890).

Almost surely, 2^28148667 is an apocalyptic number.

28148667 is a deficient number, since it is larger than the sum of its proper divisors (9382893).

28148667 is an equidigital number, since it uses as much as digits as its factorization.

28148667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9382892.

The product of its digits is 129024, while the sum is 42.

The square root of 28148667 is about 5305.5317358395. The cubic root of 28148667 is about 304.1953780700.

The spelling of 28148667 in words is "twenty-eight million, one hundred forty-eight thousand, six hundred sixty-seven".