8720638489 has 8 divisors (see below), whose sum is σ = 9040591872. Its totient is φ = 8403100320.

The previous prime is 8720638483. The next prime is 8720638499. The reversal of 8720638489 is 9848360278.

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

It is a cyclic number.

It is not a de Polignac number, because 8720638489 - 2⁷ = 8720638361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8720638483) 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, 596449 + ... + 610894.

It is an arithmetic number, because the mean of its divisors is an integer number (1130073984).

Almost surely, 2^8720638489 is an apocalyptic number.

It is an amenable number.

8720638489 is a deficient number, since it is larger than the sum of its proper divisors (319953383).

8720638489 is a wasteful number, since it uses less digits than its factorization.

8720638489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1207607.

The product of its (nonzero) digits is 4644864, while the sum is 55.

The square root of 8720638489 is about 93384.3589098303. The cubic root of 8720638489 is about 2058.3351686252.

The spelling of 8720638489 in words is "eight billion, seven hundred twenty million, six hundred thirty-eight thousand, four hundred eighty-nine".