3728371221 has 8 divisors (see below), whose sum is σ = 5523512960. Its totient is φ = 2485580796.

The previous prime is 3728371211. The next prime is 3728371259. The reversal of 3728371221 is 1221738273.

It is not a de Polignac number, because 3728371221 - 2¹⁴ = 3728354837 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3728371211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69043885 + ... + 69043938.

It is an arithmetic number, because the mean of its divisors is an integer number (690439120).

Almost surely, 2^3728371221 is an apocalyptic number.

It is an amenable number.

3728371221 is a deficient number, since it is larger than the sum of its proper divisors (1795141739).

3728371221 is a wasteful number, since it uses less digits than its factorization.

3728371221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138087832 (or 138087826 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 3728371221 is about 61060.3899512605. The cubic root of 3728371221 is about 1550.6235744194.

The spelling of 3728371221 in words is "three billion, seven hundred twenty-eight million, three hundred seventy-one thousand, two hundred twenty-one".