3697640066728 has 8 divisors (see below), whose sum is σ = 6933075125130. Its totient is φ = 1848820033360.

The previous prime is 3697640066717. The next prime is 3697640066779. The reversal of 3697640066728 is 8276600467963.

It can be written as a sum of positive squares in only one way, i.e., 3200871653604 + 496768413124 = 1789098^2 + 704818^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 3697640066728.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 231102504163 + ... + 231102504178.

Almost surely, 2^{3697640066728} is an apocalyptic number.

It is an amenable number.

3697640066728 is a deficient number, since it is larger than the sum of its proper divisors (3235435058402).

3697640066728 is a wasteful number, since it uses less digits than its factorization.

3697640066728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462205008347 (or 462205008343 counting only the distinct ones).

The product of its (nonzero) digits is 109734912, while the sum is 64.

The spelling of 3697640066728 in words is "three trillion, six hundred ninety-seven billion, six hundred forty million, sixty-six thousand, seven hundred twenty-eight".