28505072 has 10 divisors (see below), whose sum is σ = 55228608. Its totient is φ = 14252528.

The previous prime is 28505053. The next prime is 28505093. The reversal of 28505072 is 27050582.

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, 890768 + ... + 890799.

Almost surely, 2^28505072 is an apocalyptic number.

It is an amenable number.

28505072 is a deficient number, since it is larger than the sum of its proper divisors (26723536).

28505072 is a wasteful number, since it uses less digits than its factorization.

28505072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1781575 (or 1781569 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 29.

The square root of 28505072 is about 5339.0141412062. The cubic root of 28505072 is about 305.4738562742.

The spelling of 28505072 in words is "twenty-eight million, five hundred five thousand, seventy-two".