28771684 has 18 divisors (see below), whose sum is σ = 53488610. Its totient is φ = 13539072.

The previous prime is 28771679. The next prime is 28771697. The reversal of 28771684 is 48617782.

It can be written as a sum of positive squares in 3 ways, for example, as 2965284 + 25806400 = 1722^2 + 5080^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28771684.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11289 + ... + 13600.

Almost surely, 2^28771684 is an apocalyptic number.

It is an amenable number.

28771684 is a deficient number, since it is larger than the sum of its proper divisors (24716926).

28771684 is a wasteful number, since it uses less digits than its factorization.

28771684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24927 (or 24908 counting only the distinct ones).

The product of its digits is 150528, while the sum is 43.

The square root of 28771684 is about 5363.9243096822. The cubic root of 28771684 is about 306.4232825261.

The spelling of 28771684 in words is "twenty-eight million, seven hundred seventy-one thousand, six hundred eighty-four".