7816972687 has 4 divisors (see below), whose sum is σ = 7850522160. Its totient is φ = 7783423216.

The previous prime is 7816972663. The next prime is 7816972693. The reversal of 7816972687 is 7862796187.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 7816972687 - 2¹¹ = 7816970639 is a prime.

It is a super-2 number, since 2×7816972687² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7816972627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16774387 + ... + 16774852.

It is an arithmetic number, because the mean of its divisors is an integer number (1962630540).

Almost surely, 2^7816972687 is an apocalyptic number.

7816972687 is a deficient number, since it is larger than the sum of its proper divisors (33549473).

7816972687 is a wasteful number, since it uses less digits than its factorization.

7816972687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33549472.

The product of its digits is 14224896, while the sum is 61.

The square root of 7816972687 is about 88413.6453665383. The cubic root of 7816972687 is about 1984.6299066170.

The spelling of 7816972687 in words is "seven billion, eight hundred sixteen million, nine hundred seventy-two thousand, six hundred eighty-seven".