8470748721 has 4 divisors (see below), whose sum is σ = 11294331632. Its totient is φ = 5647165812.

The previous prime is 8470748687. The next prime is 8470748731. The reversal of 8470748721 is 1278470748.

8470748721 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 8470748721 - 2²² = 8466554417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8470748731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1411791451 + ... + 1411791456.

It is an arithmetic number, because the mean of its divisors is an integer number (2823582908).

Almost surely, 2^8470748721 is an apocalyptic number.

It is an amenable number.

8470748721 is a deficient number, since it is larger than the sum of its proper divisors (2823582911).

8470748721 is a wasteful number, since it uses less digits than its factorization.

8470748721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2823582910.

The product of its (nonzero) digits is 702464, while the sum is 48.

The square root of 8470748721 is about 92036.6705232213. The cubic root of 8470748721 is about 2038.4838087602.

The spelling of 8470748721 in words is "eight billion, four hundred seventy million, seven hundred forty-eight thousand, seven hundred twenty-one".