28723167 has 20 divisors (see below), whose sum is σ = 46809576. Its totient is φ = 17407440.

The previous prime is 28723129. The next prime is 28723169. The reversal of 28723167 is 76132782.

It is a de Polignac number, because none of the positive numbers 2^k-28723167 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28723169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 15228 + ... + 17009.

Almost surely, 2^28723167 is an apocalyptic number.

28723167 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

28723167 is a deficient number, since it is larger than the sum of its proper divisors (18086409).

28723167 is a wasteful number, since it uses less digits than its factorization.

28723167 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32260 (or 32251 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 28723167 is about 5359.3998731201. The cubic root of 28723167 is about 306.2509475467.

The spelling of 28723167 in words is "twenty-eight million, seven hundred twenty-three thousand, one hundred sixty-seven".