8721371747 has 16 divisors (see below), whose sum is σ = 9725363712. Its totient is φ = 7752873120.

The previous prime is 8721371731. The next prime is 8721371759. The reversal of 8721371747 is 7471731278.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 8721371747 - 2⁴ = 8721371731 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8721371777) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 620168 + ... + 634074.

It is an arithmetic number, because the mean of its divisors is an integer number (607835232).

Almost surely, 2^8721371747 is an apocalyptic number.

8721371747 is a deficient number, since it is larger than the sum of its proper divisors (1003991965).

8721371747 is a wasteful number, since it uses less digits than its factorization.

8721371747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15178.

The product of its digits is 460992, while the sum is 47.

The square root of 8721371747 is about 93388.2848487967. The cubic root of 8721371747 is about 2058.3928573839.

The spelling of 8721371747 in words is "eight billion, seven hundred twenty-one million, three hundred seventy-one thousand, seven hundred forty-seven".