4720809681 has 20 divisors (see below), whose sum is σ = 8059513792. Its totient is φ = 2697605208.

The previous prime is 4720809647. The next prime is 4720809683. The reversal of 4720809681 is 1869080274.

It is not a de Polignac number, because 4720809681 - 2⁶ = 4720809617 is a prime.

It is a super-2 number, since 2×4720809681² = 44572088088446643522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4720809683) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4162405 + ... + 4163538.

Almost surely, 2^4720809681 is an apocalyptic number.

It is an amenable number.

4720809681 is a deficient number, since it is larger than the sum of its proper divisors (3338704111).

4720809681 is an equidigital number, since it uses as much as digits as its factorization.

4720809681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8325962 (or 8325953 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The square root of 4720809681 is about 68708.1485778798. The cubic root of 4720809681 is about 1677.5372173604.

The spelling of 4720809681 in words is "four billion, seven hundred twenty million, eight hundred nine thousand, six hundred eighty-one".