8728120949 has 4 divisors (see below), whose sum is σ = 8728349664. Its totient is φ = 8727892236.

The previous prime is 8728120913. The next prime is 8728120979. The reversal of 8728120949 is 9490218278.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8728120949 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8728120897 and 8728120906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8728120979) 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, 41747 + ... + 138560.

It is an arithmetic number, because the mean of its divisors is an integer number (2182087416).

Almost surely, 2^8728120949 is an apocalyptic number.

It is an amenable number.

8728120949 is a deficient number, since it is larger than the sum of its proper divisors (228715).

8728120949 is a wasteful number, since it uses less digits than its factorization.

8728120949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228714.

The product of its (nonzero) digits is 580608, while the sum is 50.

The square root of 8728120949 is about 93424.4130246479. The cubic root of 8728120949 is about 2058.9236961660.

The spelling of 8728120949 in words is "eight billion, seven hundred twenty-eight million, one hundred twenty thousand, nine hundred forty-nine".