28171970 has 8 divisors (see below), whose sum is σ = 50709564. Its totient is φ = 11268784.

The previous prime is 28171967. The next prime is 28171973. The reversal of 28171970 is 7917182.

It is an interprime number because it is at equal distance from previous prime (28171967) and next prime (28171973).

It can be written as a sum of positive squares in 2 ways, for example, as 24512401 + 3659569 = 4951^2 + 1913^2 .

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28171970.

It is not an unprimeable number, because it can be changed into a prime (28171973) 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, 1408589 + ... + 1408608.

Almost surely, 2^28171970 is an apocalyptic number.

28171970 is a deficient number, since it is larger than the sum of its proper divisors (22537594).

28171970 is a wasteful number, since it uses less digits than its factorization.

28171970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2817204.

The product of its (nonzero) digits is 7056, while the sum is 35.

The square root of 28171970 is about 5307.7273856143. The cubic root of 28171970 is about 304.2792980849.

The spelling of 28171970 in words is "twenty-eight million, one hundred seventy-one thousand, nine hundred seventy".