28775712 has 48 divisors (see below), whose sum is σ = 86329152. Its totient is φ = 8221440.

The previous prime is 28775699. The next prime is 28775741. The reversal of 28775712 is 21757782.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×28775712² = 1656083202213888, which contains 22 as substring.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 20739 + ... + 22082.

It is an arithmetic number, because the mean of its divisors is an integer number (1798524).

Almost surely, 2^28775712 is an apocalyptic number.

It is an amenable number.

28775712 is an abundant number, since it is smaller than the sum of its proper divisors (57553440).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28775712 is a wasteful number, since it uses less digits than its factorization.

28775712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42841 (or 42833 counting only the distinct ones).

The product of its digits is 54880, while the sum is 39.

The square root of 28775712 is about 5364.2997679101. The cubic root of 28775712 is about 306.4375814851.

The spelling of 28775712 in words is "twenty-eight million, seven hundred seventy-five thousand, seven hundred twelve".