3693721644 has 36 divisors (see below), whose sum is σ = 9339109416. Its totient is φ = 1230950208.

The previous prime is 3693721637. The next prime is 3693721663. The reversal of 3693721644 is 4461273963.

3693721644 is a `hidden beast` number, since 369 + 37 + 216 + 44 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 3693721644.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 188032 + ... + 206744.

It is an arithmetic number, because the mean of its divisors is an integer number (259419706).

Almost surely, 2^3693721644 is an apocalyptic number.

It is an amenable number.

3693721644 is an abundant number, since it is smaller than the sum of its proper divisors (5645387772).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3693721644 is a wasteful number, since it uses less digits than its factorization.

3693721644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24206 (or 24201 counting only the distinct ones).

The product of its digits is 653184, while the sum is 45.

The square root of 3693721644 is about 60775.9956232722. The cubic root of 3693721644 is about 1545.8050487557.

The spelling of 3693721644 in words is "three billion, six hundred ninety-three million, seven hundred twenty-one thousand, six hundred forty-four".