75721385684 has 12 divisors (see below), whose sum is σ = 151442771424. Its totient is φ = 32452022424.

The previous prime is 75721385681. The next prime is 75721385689. The reversal of 75721385684 is 48658312757.

75721385684 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75721385681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1352167574 + ... + 1352167629.

It is an arithmetic number, because the mean of its divisors is an integer number (12620230952).

Almost surely, 2^75721385684 is an apocalyptic number.

It is an amenable number.

75721385684 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

75721385684 is a wasteful number, since it uses less digits than its factorization.

75721385684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2704335214 (or 2704335212 counting only the distinct ones).

The product of its digits is 11289600, while the sum is 56.

The spelling of 75721385684 in words is "seventy-five billion, seven hundred twenty-one million, three hundred eighty-five thousand, six hundred eighty-four".