8632721909 has 4 divisors (see below), whose sum is σ = 9865967904. Its totient is φ = 7399475916.

The previous prime is 8632721899. The next prime is 8632721917. The reversal of 8632721909 is 9091272368.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 8632721909 - 2⁴ = 8632721893 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 (8632721969) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 616622987 + ... + 616623000.

It is an arithmetic number, because the mean of its divisors is an integer number (2466491976).

Almost surely, 2^8632721909 is an apocalyptic number.

It is an amenable number.

8632721909 is a deficient number, since it is larger than the sum of its proper divisors (1233245995).

8632721909 is a wasteful number, since it uses less digits than its factorization.

8632721909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1233245994.

The product of its (nonzero) digits is 326592, while the sum is 47.

The square root of 8632721909 is about 92912.4421646531. The cubic root of 8632721909 is about 2051.3948000526.

The spelling of 8632721909 in words is "eight billion, six hundred thirty-two million, seven hundred twenty-one thousand, nine hundred nine".