7815983868 has 360 divisors, whose sum is σ = 27036240000. Its totient is φ = 1921993920.

The previous prime is 7815983837. The next prime is 7815983893. The reversal of 7815983868 is 8683895187.

7815983868 is a `hidden beast` number, since 7 + 8 + 1 + 598 + 38 + 6 + 8 = 666.

It is a super-2 number, since 2×7815983868² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 5213383 + ... + 5214881.

Almost surely, 2^7815983868 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7815983868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13518120000).

7815983868 is an abundant number, since it is smaller than the sum of its proper divisors (19220256132).

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

7815983868 is a wasteful number, since it uses less digits than its factorization.

7815983868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1563 (or 1541 counting only the distinct ones).

The product of its digits is 23224320, while the sum is 63.

The square root of 7815983868 is about 88408.0531852161. The cubic root of 7815983868 is about 1984.5462202339.

The spelling of 7815983868 in words is "seven billion, eight hundred fifteen million, nine hundred eighty-three thousand, eight hundred sixty-eight".