7821166764 has 24 divisors (see below), whose sum is σ = 19209883840. Its totient is φ = 2469842064.

The previous prime is 7821166697. The next prime is 7821166781. The reversal of 7821166764 is 4676611287.

It is a super-2 number, since 2×7821166764² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17151454 + ... + 17151909.

Almost surely, 2^7821166764 is an apocalyptic number.

It is an amenable number.

7821166764 is an abundant number, since it is smaller than the sum of its proper divisors (11388717076).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7821166764 is a wasteful number, since it uses less digits than its factorization.

7821166764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34303389 (or 34303387 counting only the distinct ones).

The product of its digits is 677376, while the sum is 48.

The square root of 7821166764 is about 88437.3606797489. The cubic root of 7821166764 is about 1984.9847840856.

The spelling of 7821166764 in words is "seven billion, eight hundred twenty-one million, one hundred sixty-six thousand, seven hundred sixty-four".