7887579987 has 16 divisors (see below), whose sum is σ = 12027488000. Its totient is φ = 4504069152.

The previous prime is 7887579977. The next prime is 7887580013. The reversal of 7887579987 is 7899757887.

It is not a de Polignac number, because 7887579987 - 2⁷ = 7887579859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7887579967) 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, 98737 + ... + 159762.

It is an arithmetic number, because the mean of its divisors is an integer number (751718000).

Almost surely, 2^7887579987 is an apocalyptic number.

7887579987 is a deficient number, since it is larger than the sum of its proper divisors (4139908013).

7887579987 is a wasteful number, since it uses less digits than its factorization.

7887579987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259962.

The product of its digits is 497871360, while the sum is 75.

The square root of 7887579987 is about 88812.0486589517. The cubic root of 7887579987 is about 1990.5874369045.

The spelling of 7887579987 in words is "seven billion, eight hundred eighty-seven million, five hundred seventy-nine thousand, nine hundred eighty-seven".