7891440002 has 8 divisors (see below), whose sum is σ = 11837563212. Its totient is φ = 3945585600.

The previous prime is 7891439891. The next prime is 7891440017. The reversal of 7891440002 is 2000441987.

It can be written as a sum of positive squares in 2 ways, for example, as 6997489801 + 893950201 = 83651^2 + 29899^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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, 41102 + ... + 132182.

Almost surely, 2^7891440002 is an apocalyptic number.

7891440002 is a deficient number, since it is larger than the sum of its proper divisors (3946123210).

7891440002 is a wasteful number, since it uses less digits than its factorization.

7891440002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134404.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 7891440002 is about 88833.7773709978. Note that the first 3 decimals coincide. The cubic root of 7891440002 is about 1990.9121010941.

Adding to 7891440002 its reverse (2000441987), we get a palindrome (9891881989).

The spelling of 7891440002 in words is "seven billion, eight hundred ninety-one million, four hundred forty thousand, two".