3728158221 has 8 divisors (see below), whose sum is σ = 5105225824. Its totient is φ = 2418264720.

The previous prime is 3728158219. The next prime is 3728158309. The reversal of 3728158221 is 1228518273.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3728158221 - 2¹ = 3728158219 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3728158221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3728108221) 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, 16793395 + ... + 16793616.

It is an arithmetic number, because the mean of its divisors is an integer number (638153228).

Almost surely, 2^3728158221 is an apocalyptic number.

It is an amenable number.

3728158221 is a deficient number, since it is larger than the sum of its proper divisors (1377067603).

3728158221 is a wasteful number, since it uses less digits than its factorization.

3728158221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33587051.

The product of its digits is 53760, while the sum is 39.

The square root of 3728158221 is about 61058.6457514413. The cubic root of 3728158221 is about 1550.5940450717.

The spelling of 3728158221 in words is "three billion, seven hundred twenty-eight million, one hundred fifty-eight thousand, two hundred twenty-one".