28705612 has 12 divisors (see below), whose sum is σ = 54099136. Its totient is φ = 13248720.

The previous prime is 28705603. The next prime is 28705613. The reversal of 28705612 is 21650782.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28705613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 275964 + ... + 276067.

Almost surely, 2^28705612 is an apocalyptic number.

It is an amenable number.

28705612 is a deficient number, since it is larger than the sum of its proper divisors (25393524).

28705612 is a wasteful number, since it uses less digits than its factorization.

28705612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 552048 (or 552046 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 28705612 is about 5357.7618461443. The cubic root of 28705612 is about 306.1885434365.

The spelling of 28705612 in words is "twenty-eight million, seven hundred five thousand, six hundred twelve".