7818983640 has 96 divisors (see below), whose sum is σ = 27366459120. Its totient is φ = 1924671744.

The previous prime is 7818983639. The next prime is 7818983651. The reversal of 7818983640 is 463898187.

It is a super-2 number, since 2×7818983640² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 830682 + ... + 840041.

Almost surely, 2^7818983640 is an apocalyptic number.

It is an amenable number.

7818983640 is an abundant number, since it is smaller than the sum of its proper divisors (19547475480).

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

7818983640 is a wasteful number, since it uses less digits than its factorization.

7818983640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1670753 (or 1670746 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 54.

The square root of 7818983640 is about 88425.0170483444. The cubic root of 7818983640 is about 1984.8000771523.

The spelling of 7818983640 in words is "seven billion, eight hundred eighteen million, nine hundred eighty-three thousand, six hundred forty".