7894420081 has 4 divisors (see below), whose sum is σ = 7894845952. Its totient is φ = 7893994212.

The previous prime is 7894420073. The next prime is 7894420109. The reversal of 7894420081 is 1800244987.

7894420081 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 a cyclic number.

It is not a de Polignac number, because 7894420081 - 2³ = 7894420073 is a prime.

It is a super-2 number, since 2×7894420081² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7894480081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 183801 + ... + 222646.

It is an arithmetic number, because the mean of its divisors is an integer number (1973711488).

Almost surely, 2^7894420081 is an apocalyptic number.

It is an amenable number.

7894420081 is a deficient number, since it is larger than the sum of its proper divisors (425871).

7894420081 is a wasteful number, since it uses less digits than its factorization.

7894420081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425870.

The product of its (nonzero) digits is 129024, while the sum is 43.

The square root of 7894420081 is about 88850.5491316739. The cubic root of 7894420081 is about 1991.1626818354.

The spelling of 7894420081 in words is "seven billion, eight hundred ninety-four million, four hundred twenty thousand, eighty-one".