7897447987 has 16 divisors (see below), whose sum is σ = 9405230688. Its totient is φ = 6536436480.

The previous prime is 7897447981. The next prime is 7897447993.

7897447987 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (7897447981) and next prime (7897447993).

It is a cyclic number.

It is not a de Polignac number, because 7897447987 - 2²⁷ = 7763230259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7897447981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 367828 + ... + 388705.

It is an arithmetic number, because the mean of its divisors is an integer number (587826918).

Almost surely, 2^7897447987 is an apocalyptic number.

7897447987 is a deficient number, since it is larger than the sum of its proper divisors (1507782701).

7897447987 is a wasteful number, since it uses less digits than its factorization.

7897447987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 756630.

The product of its digits is 199148544, while the sum is 70.

The square root of 7897447987 is about 88867.5868188171. The cubic root of 7897447987 is about 1991.4172195434.

The spelling of 7897447987 in words is "seven billion, eight hundred ninety-seven million, four hundred forty-seven thousand, nine hundred eighty-seven".