28611868 has 6 divisors (see below), whose sum is σ = 50070776. Its totient is φ = 14305932.

The previous prime is 28611859. The next prime is 28611871. The reversal of 28611868 is 86811682.

It is a self number, because there is not a number n which added to its sum of digits gives 28611868.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3576480 + ... + 3576487.

Almost surely, 2^28611868 is an apocalyptic number.

It is an amenable number.

28611868 is a deficient number, since it is larger than the sum of its proper divisors (21458908).

28611868 is a wasteful number, since it uses less digits than its factorization.

28611868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7152971 (or 7152969 counting only the distinct ones).

The product of its digits is 36864, while the sum is 40.

The square root of 28611868 is about 5349.0062628492. The cubic root of 28611868 is about 305.8548730128.

The spelling of 28611868 in words is "twenty-eight million, six hundred eleven thousand, eight hundred sixty-eight".