4639679521 has 32 divisors (see below), whose sum is σ = 5137862400. Its totient is φ = 4172716800.

The previous prime is 4639679509. The next prime is 4639679557. The reversal of 4639679521 is 1259769364.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4639679521 is a prime.

It is a Duffinian number.

Its product of digits (2449440) is a multiple of the sum of its prime divisors (729).

It is not an unprimeable number, because it can be changed into a prime (4639679021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14636055 + ... + 14636371.

It is an arithmetic number, because the mean of its divisors is an integer number (160558200).

Almost surely, 2^4639679521 is an apocalyptic number.

It is an amenable number.

4639679521 is a deficient number, since it is larger than the sum of its proper divisors (498182879).

4639679521 is a wasteful number, since it uses less digits than its factorization.

4639679521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 729.

The product of its digits is 2449440, while the sum is 52.

The square root of 4639679521 is about 68115.1930262258. The cubic root of 4639679521 is about 1667.8717820393.

The spelling of 4639679521 in words is "four billion, six hundred thirty-nine million, six hundred seventy-nine thousand, five hundred twenty-one".