28771871 has 16 divisors (see below), whose sum is σ = 32283360. Its totient is φ = 25482240.

The previous prime is 28771819. The next prime is 28771889. The reversal of 28771871 is 17817782.

It is a cyclic number.

It is not a de Polignac number, because 28771871 - 2⁶ = 28771807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28771801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90605 + ... + 90921.

It is an arithmetic number, because the mean of its divisors is an integer number (2017710).

Almost surely, 2^28771871 is an apocalyptic number.

28771871 is a deficient number, since it is larger than the sum of its proper divisors (3511489).

28771871 is a wasteful number, since it uses less digits than its factorization.

28771871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 634.

The product of its digits is 43904, while the sum is 41.

The square root of 28771871 is about 5363.9417409215. The cubic root of 28771871 is about 306.4239463852.

The spelling of 28771871 in words is "twenty-eight million, seven hundred seventy-one thousand, eight hundred seventy-one".