28769533644 has 12 divisors (see below), whose sum is σ = 67128911864. Its totient is φ = 9589844544.

The previous prime is 28769533633. The next prime is 28769533657. The reversal of 28769533644 is 44633596782.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1198730557 + ... + 1198730580.

Almost surely, 2^28769533644 is an apocalyptic number.

It is an amenable number.

28769533644 is an abundant number, since it is smaller than the sum of its proper divisors (38359378220).

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

28769533644 is a wasteful number, since it uses less digits than its factorization.

28769533644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2397461144 (or 2397461142 counting only the distinct ones).

The product of its digits is 26127360, while the sum is 57.

The spelling of 28769533644 in words is "twenty-eight billion, seven hundred sixty-nine million, five hundred thirty-three thousand, six hundred forty-four".