3728689997 has 2 divisors, whose sum is σ = 3728689998. Its totient is φ = 3728689996.

The previous prime is 3728689931. The next prime is 3728690029. The reversal of 3728689997 is 7999868273.

3728689997 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2548836196 + 1179853801 = 50486^2 + 34349^2 .

It is a cyclic number.

It is not a de Polignac number, because 3728689997 - 2²² = 3724495693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3728689927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1864344998 + 1864344999.

It is an arithmetic number, because the mean of its divisors is an integer number (1864344999).

Almost surely, 2^3728689997 is an apocalyptic number.

It is an amenable number.

3728689997 is a deficient number, since it is larger than the sum of its proper divisors (1).

3728689997 is an equidigital number, since it uses as much as digits as its factorization.

3728689997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82301184, while the sum is 68.

The square root of 3728689997 is about 61063.0002292714. Note that the first 3 decimals coincide. The cubic root of 3728689997 is about 1550.6677659680.

The spelling of 3728689997 in words is "three billion, seven hundred twenty-eight million, six hundred eighty-nine thousand, nine hundred ninety-seven".