75447612728 has 32 divisors (see below), whose sum is σ = 141699740160. Its totient is φ = 37661073120.

The previous prime is 75447612703. The next prime is 75447612761. The reversal of 75447612728 is 82721674457.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 75447612728.

It is a congruent number.

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, 21269051 + ... + 21272597.

It is an arithmetic number, because the mean of its divisors is an integer number (4428116880).

Almost surely, 2^75447612728 is an apocalyptic number.

It is an amenable number.

75447612728 is a deficient number, since it is larger than the sum of its proper divisors (66252127432).

75447612728 is a wasteful number, since it uses less digits than its factorization.

75447612728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7227 (or 7223 counting only the distinct ones).

The product of its digits is 5268480, while the sum is 53.

The spelling of 75447612728 in words is "seventy-five billion, four hundred forty-seven million, six hundred twelve thousand, seven hundred twenty-eight".