28561916 has 6 divisors (see below), whose sum is σ = 49983360. Its totient is φ = 14280956.

The previous prime is 28561913. The next prime is 28561927. The reversal of 28561916 is 61916582.

It is a self number, because there is not a number n which added to its sum of digits gives 28561916.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28561913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3570236 + ... + 3570243.

It is an arithmetic number, because the mean of its divisors is an integer number (8330560).

Almost surely, 2^28561916 is an apocalyptic number.

It is an amenable number.

28561916 is a deficient number, since it is larger than the sum of its proper divisors (21421444).

28561916 is a wasteful number, since it uses less digits than its factorization.

28561916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7140483 (or 7140481 counting only the distinct ones).

The product of its digits is 25920, while the sum is 38.

The square root of 28561916 is about 5344.3349445932. The cubic root of 28561916 is about 305.6767771924.

The spelling of 28561916 in words is "twenty-eight million, five hundred sixty-one thousand, nine hundred sixteen".