28170987 has 8 divisors (see below), whose sum is σ = 40450704. Its totient is φ = 17335968.

The previous prime is 28170979. The next prime is 28170997. The reversal of 28170987 is 78907182.

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

It is not a de Polignac number, because 28170987 - 2³ = 28170979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28170917) 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 7 ways as a sum of consecutive naturals, for example, 361128 + ... + 361205.

It is an arithmetic number, because the mean of its divisors is an integer number (5056338).

Almost surely, 2^28170987 is an apocalyptic number.

28170987 is a deficient number, since it is larger than the sum of its proper divisors (12279717).

28170987 is a wasteful number, since it uses less digits than its factorization.

28170987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 722349.

The product of its (nonzero) digits is 56448, while the sum is 42.

The square root of 28170987 is about 5307.6347839692. The cubic root of 28170987 is about 304.2757589876.

The spelling of 28170987 in words is "twenty-eight million, one hundred seventy thousand, nine hundred eighty-seven".