28687293009 has 6 divisors (see below), whose sum is σ = 41437201026. Its totient is φ = 19124862000.

The previous prime is 28687292969. The next prime is 28687293043. The reversal of 28687293009 is 90039278682.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 20948220225 + 7739072784 = 144735^2 + 87972^2 .

It is a de Polignac number, because none of the positive numbers 2^k-28687293009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28687293079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1593738492 + ... + 1593738509.

It is an arithmetic number, because the mean of its divisors is an integer number (6906200171).

Almost surely, 2^28687293009 is an apocalyptic number.

It is an amenable number.

28687293009 is a deficient number, since it is larger than the sum of its proper divisors (12749908017).

28687293009 is a wasteful number, since it uses less digits than its factorization.

28687293009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3187477007 (or 3187477004 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 54.

The spelling of 28687293009 in words is "twenty-eight billion, six hundred eighty-seven million, two hundred ninety-three thousand, nine".