28513771 has 12 divisors (see below), whose sum is σ = 33754336. Its totient is φ = 23926320.

The previous prime is 28513763. The next prime is 28513781. The reversal of 28513771 is 17731582.

It is not a de Polignac number, because 28513771 - 2³ = 28513763 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28513711) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7491 + ... + 10636.

Almost surely, 2^28513771 is an apocalyptic number.

28513771 is a deficient number, since it is larger than the sum of its proper divisors (5240565).

28513771 is a wasteful number, since it uses less digits than its factorization.

28513771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18162 (or 18151 counting only the distinct ones).

The product of its digits is 11760, while the sum is 34.

The square root of 28513771 is about 5339.8287425722. The cubic root of 28513771 is about 305.5049273155.

The spelling of 28513771 in words is "twenty-eight million, five hundred thirteen thousand, seven hundred seventy-one".