8720470393 has 4 divisors (see below), whose sum is σ = 8956158820. Its totient is φ = 8484781968.

The previous prime is 8720470351. The next prime is 8720470439. The reversal of 8720470393 is 3930740278.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3930740278 = 2 ⋅1965370139.

It can be written as a sum of positive squares in 2 ways, for example, as 6709575744 + 2010894649 = 81912^2 + 44843^2 .

It is a cyclic number.

It is not a de Polignac number, because 8720470393 - 2¹⁷ = 8720339321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8720470333) 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, 117844158 + ... + 117844231.

It is an arithmetic number, because the mean of its divisors is an integer number (2239039705).

Almost surely, 2^8720470393 is an apocalyptic number.

It is an amenable number.

8720470393 is a deficient number, since it is larger than the sum of its proper divisors (235688427).

8720470393 is a wasteful number, since it uses less digits than its factorization.

8720470393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235688426.

The product of its (nonzero) digits is 254016, while the sum is 43.

The square root of 8720470393 is about 93383.4588832519. The cubic root of 8720470393 is about 2058.3219432889.

The spelling of 8720470393 in words is "eight billion, seven hundred twenty million, four hundred seventy thousand, three hundred ninety-three".