3649638731 has 8 divisors (see below), whose sum is σ = 3842356800. Its totient is φ = 3456983880.

The previous prime is 3649638721. The next prime is 3649638749. The reversal of 3649638731 is 1378369463.

It is a happy number.

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

It is not a de Polignac number, because 3649638731 - 2²² = 3645444427 is a prime.

It is a super-3 number, since 3×3649638731³ (a number of 30 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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 3649638731.

It is not an unprimeable number, because it can be changed into a prime (3649638701) 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, 144476 + ... + 167846.

It is an arithmetic number, because the mean of its divisors is an integer number (480294600).

Almost surely, 2^3649638731 is an apocalyptic number.

3649638731 is a deficient number, since it is larger than the sum of its proper divisors (192718069).

3649638731 is a wasteful number, since it uses less digits than its factorization.

3649638731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31609.

The product of its digits is 1959552, while the sum is 50.

The square root of 3649638731 is about 60412.2399104685. The cubic root of 3649638731 is about 1539.6309245136.

The spelling of 3649638731 in words is "three billion, six hundred forty-nine million, six hundred thirty-eight thousand, seven hundred thirty-one".