7173978987 has 16 divisors (see below), whose sum is σ = 11284416512. Its totient is φ = 3967176960.

The previous prime is 7173978919. The next prime is 7173978991. The reversal of 7173978987 is 7898793717.

It is a happy number.

It is not a de Polignac number, because 7173978987 - 2²³ = 7165590379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7173970987) 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, 5509318 + ... + 5510619.

It is an arithmetic number, because the mean of its divisors is an integer number (705276032).

Almost surely, 2^7173978987 is an apocalyptic number.

7173978987 is a deficient number, since it is larger than the sum of its proper divisors (4110437525).

7173978987 is a wasteful number, since it uses less digits than its factorization.

7173978987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11019978.

The product of its digits is 37340352, while the sum is 66.

The square root of 7173978987 is about 84699.3446668863. The cubic root of 7173978987 is about 1928.6497564480.

The spelling of 7173978987 in words is "seven billion, one hundred seventy-three million, nine hundred seventy-eight thousand, nine hundred eighty-seven".