8623647721 has 8 divisors (see below), whose sum is σ = 9502982720. Its totient is φ = 7775166672.

The previous prime is 8623647719. The next prime is 8623647731. The reversal of 8623647721 is 1277463268.

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

It is not a de Polignac number, because 8623647721 - 2¹ = 8623647719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8623647701) 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 7 ways as a sum of consecutive naturals, for example, 7712901 + ... + 7714018.

It is an arithmetic number, because the mean of its divisors is an integer number (1187872840).

Almost surely, 2^8623647721 is an apocalyptic number.

It is an amenable number.

8623647721 is a deficient number, since it is larger than the sum of its proper divisors (879334999).

8623647721 is a wasteful number, since it uses less digits than its factorization.

8623647721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15426975.

The product of its digits is 677376, while the sum is 46.

The square root of 8623647721 is about 92863.5973942427. The cubic root of 8623647721 is about 2050.6757812499.

The spelling of 8623647721 in words is "eight billion, six hundred twenty-three million, six hundred forty-seven thousand, seven hundred twenty-one".