28727667 has 24 divisors (see below), whose sum is σ = 43658784. Its totient is φ = 18167424.

The previous prime is 28727623. The next prime is 28727683. The reversal of 28727667 is 76672782.

It is a happy number.

It is not a de Polignac number, because 28727667 - 2¹⁵ = 28694899 is a prime.

Its product of digits (395136) is a multiple of the sum of its prime divisors (1176).

It is not an unprimeable number, because it can be changed into a prime (28727267) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27853 + ... + 28865.

It is an arithmetic number, because the mean of its divisors is an integer number (1819116).

Almost surely, 2^28727667 is an apocalyptic number.

28727667 is a deficient number, since it is larger than the sum of its proper divisors (14931117).

28727667 is a wasteful number, since it uses less digits than its factorization.

28727667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1179 (or 1176 counting only the distinct ones).

The product of its digits is 395136, while the sum is 45.

The square root of 28727667 is about 5359.8196798027. The cubic root of 28727667 is about 306.2669399487.

The spelling of 28727667 in words is "twenty-eight million, seven hundred twenty-seven thousand, six hundred sixty-seven".