7897997987 has 8 divisors (see below), whose sum is σ = 8616906480. Its totient is φ = 7179240960.

The previous prime is 7897997981. The next prime is 7897998001.

7897997987 is nontrivially palindromic in base 10.

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

It is a cyclic number.

It is not a de Polignac number, because 7897997987 - 2¹⁰ = 7897996963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7897997981) 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 7 ways as a sum of consecutive naturals, for example, 89939 + ... + 154547.

It is an arithmetic number, because the mean of its divisors is an integer number (1077113310).

Almost surely, 2^7897997987 is an apocalyptic number.

7897997987 is a deficient number, since it is larger than the sum of its proper divisors (718908493).

7897997987 is a wasteful number, since it uses less digits than its factorization.

7897997987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75733.

The product of its digits is 1008189504, while the sum is 80.

The square root of 7897997987 is about 88870.6812565314. The cubic root of 7897997987 is about 1991.4634477278.

The spelling of 7897997987 in words is "seven billion, eight hundred ninety-seven million, nine hundred ninety-seven thousand, nine hundred eighty-seven".