28771361 has 4 divisors (see below), whose sum is σ = 30463812. Its totient is φ = 27078912.

The previous prime is 28771333. The next prime is 28771363. The reversal of 28771361 is 16317782.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24690961 + 4080400 = 4969^2 + 2020^2 .

It is a cyclic number.

It is not a de Polignac number, because 28771361 - 2¹⁰ = 28770337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28771363) 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, 846200 + ... + 846233.

It is an arithmetic number, because the mean of its divisors is an integer number (7615953).

Almost surely, 2^28771361 is an apocalyptic number.

It is an amenable number.

28771361 is a deficient number, since it is larger than the sum of its proper divisors (1692451).

28771361 is a wasteful number, since it uses less digits than its factorization.

28771361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1692450.

The product of its digits is 14112, while the sum is 35.

The square root of 28771361 is about 5363.8942010446. The cubic root of 28771361 is about 306.4221358537.

The spelling of 28771361 in words is "twenty-eight million, seven hundred seventy-one thousand, three hundred sixty-one".