28671571 has 4 divisors (see below), whose sum is σ = 30358152. Its totient is φ = 26984992.

The previous prime is 28671557. The next prime is 28671611. The reversal of 28671571 is 17517682.

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 28671571 - 2⁹ = 28671059 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28671571.

It is not an unprimeable number, because it can be changed into a prime (28671521) 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, 843265 + ... + 843298.

It is an arithmetic number, because the mean of its divisors is an integer number (7589538).

Almost surely, 2^28671571 is an apocalyptic number.

28671571 is a deficient number, since it is larger than the sum of its proper divisors (1686581).

28671571 is a wasteful number, since it uses less digits than its factorization.

28671571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1686580.

The product of its digits is 23520, while the sum is 37.

The square root of 28671571 is about 5354.5841108344. The cubic root of 28671571 is about 306.0674627340.

The spelling of 28671571 in words is "twenty-eight million, six hundred seventy-one thousand, five hundred seventy-one".