7893993987 has 24 divisors (see below), whose sum is σ = 12481520688. Its totient is φ = 4767892800.

The previous prime is 7893993949. The next prime is 7893994021.

7893993987 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 7893993987 - 2¹⁰ = 7893992963 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7893993907) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 107064 + ... + 165077.

It is an arithmetic number, because the mean of its divisors is an integer number (520063362).

Almost surely, 2^7893993987 is an apocalyptic number.

7893993987 is a deficient number, since it is larger than the sum of its proper divisors (4587526701).

7893993987 is a wasteful number, since it uses less digits than its factorization.

7893993987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272451 (or 272448 counting only the distinct ones).

The product of its digits is 185177664, while the sum is 72.

The square root of 7893993987 is about 88848.1512863380. The cubic root of 7893993987 is about 1991.1268574713.

The spelling of 7893993987 in words is "seven billion, eight hundred ninety-three million, nine hundred ninety-three thousand, nine hundred eighty-seven".