3630721879 has 4 divisors (see below), whose sum is σ = 3788579376. Its totient is φ = 3472864384.

The previous prime is 3630721849. The next prime is 3630721901. The reversal of 3630721879 is 9781270363.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3630721879 - 2¹³ = 3630713687 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3630721819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78928714 + ... + 78928759.

It is an arithmetic number, because the mean of its divisors is an integer number (947144844).

Almost surely, 2^3630721879 is an apocalyptic number.

3630721879 is a deficient number, since it is larger than the sum of its proper divisors (157857497).

3630721879 is a wasteful number, since it uses less digits than its factorization.

3630721879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157857496.

The product of its (nonzero) digits is 381024, while the sum is 46.

The square root of 3630721879 is about 60255.4717764287. The cubic root of 3630721879 is about 1536.9662373863.

The spelling of 3630721879 in words is "three billion, six hundred thirty million, seven hundred twenty-one thousand, eight hundred seventy-nine".