7993689987 has 4 divisors (see below), whose sum is σ = 10658253320. Its totient is φ = 5329126656.

The previous prime is 7993689983. The next prime is 7993690027. The reversal of 7993689987 is 7899863997.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7899863997 = 3 ⋅2633287999.

It is not a de Polignac number, because 7993689987 - 2² = 7993689983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7993689983) 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, 1332281662 + ... + 1332281667.

It is an arithmetic number, because the mean of its divisors is an integer number (2664563330).

Almost surely, 2^7993689987 is an apocalyptic number.

7993689987 is a deficient number, since it is larger than the sum of its proper divisors (2664563333).

7993689987 is a wasteful number, since it uses less digits than its factorization.

7993689987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2664563332.

The product of its digits is 370355328, while the sum is 75.

The square root of 7993689987 is about 89407.4380966148. The cubic root of 7993689987 is about 1999.4740272718.

The spelling of 7993689987 in words is "seven billion, nine hundred ninety-three million, six hundred eighty-nine thousand, nine hundred eighty-seven".