28705916 has 6 divisors (see below), whose sum is σ = 50235360. Its totient is φ = 14352956.

The previous prime is 28705891. The next prime is 28705921. The reversal of 28705916 is 61950782.

It is a super-2 number, since 2×28705916² = 1648059226798112, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28705916.

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, 3588236 + ... + 3588243.

It is an arithmetic number, because the mean of its divisors is an integer number (8372560).

Almost surely, 2^28705916 is an apocalyptic number.

It is an amenable number.

28705916 is a deficient number, since it is larger than the sum of its proper divisors (21529444).

28705916 is a wasteful number, since it uses less digits than its factorization.

28705916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7176483 (or 7176481 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 28705916 is about 5357.7902161246. The cubic root of 28705916 is about 306.1896243051.

The spelling of 28705916 in words is "twenty-eight million, seven hundred five thousand, nine hundred sixteen".