28751068644 has 24 divisors (see below), whose sum is σ = 71032052448. Its totient is φ = 9019943040.

The previous prime is 28751068631. The next prime is 28751068651. The reversal of 28751068644 is 44686015782.

It is a Harshad number since it is a multiple of its sum of digits (51).

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, 70468102 + ... + 70468509.

It is an arithmetic number, because the mean of its divisors is an integer number (2959668852).

Almost surely, 2^28751068644 is an apocalyptic number.

It is an amenable number.

28751068644 is an abundant number, since it is smaller than the sum of its proper divisors (42280983804).

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

28751068644 is a wasteful number, since it uses less digits than its factorization.

28751068644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140936635 (or 140936633 counting only the distinct ones).

The product of its (nonzero) digits is 2580480, while the sum is 51.

The spelling of 28751068644 in words is "twenty-eight billion, seven hundred fifty-one million, sixty-eight thousand, six hundred forty-four".