28287542066 has 16 divisors (see below), whose sum is σ = 48558213504. Its totient is φ = 12106911264.

The previous prime is 28287542051. The next prime is 28287542119. The reversal of 28287542066 is 66024578282.

It is a happy number.

It is a super-2 number, since 2×28287542066² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1349315 + ... + 1370118.

It is an arithmetic number, because the mean of its divisors is an integer number (3034888344).

Almost surely, 2^28287542066 is an apocalyptic number.

28287542066 is a deficient number, since it is larger than the sum of its proper divisors (20270671438).

28287542066 is a wasteful number, since it uses less digits than its factorization.

28287542066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2720185.

The product of its (nonzero) digits is 2580480, while the sum is 50.

The spelling of 28287542066 in words is "twenty-eight billion, two hundred eighty-seven million, five hundred forty-two thousand, sixty-six".