3727221685 has 48 divisors (see below), whose sum is σ = 5007156336. Its totient is φ = 2661120000.

The previous prime is 3727221671. The next prime is 3727221749. The reversal of 3727221685 is 5861227273.

It can be written as a sum of positive squares in 8 ways, for example, as 206698129 + 3520523556 = 14377^2 + 59334^2 .

It is not a de Polignac number, because 3727221685 - 2¹¹ = 3727219637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11059837 + ... + 11060173.

It is an arithmetic number, because the mean of its divisors is an integer number (104315757).

Almost surely, 2^3727221685 is an apocalyptic number.

It is an amenable number.

3727221685 is a deficient number, since it is larger than the sum of its proper divisors (1279934651).

3727221685 is a wasteful number, since it uses less digits than its factorization.

3727221685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646 (or 635 counting only the distinct ones).

The product of its digits is 282240, while the sum is 43.

The square root of 3727221685 is about 61050.9761183226. The cubic root of 3727221685 is about 1550.4641946491.

The spelling of 3727221685 in words is "three billion, seven hundred twenty-seven million, two hundred twenty-one thousand, six hundred eighty-five".