7731681807990 has 128 divisors (see below), whose sum is σ = 21616450394112. Its totient is φ = 1733141329920.

The previous prime is 7731681807959. The next prime is 7731681808009. The reversal of 7731681807990 is 997081861377.

It is a super-3 number, since 3×7731681807990³ (a number of 40 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 25571134 + ... + 25871726.

It is an arithmetic number, because the mean of its divisors is an integer number (168878518704).

Almost surely, 2^{7731681807990} is an apocalyptic number.

7731681807990 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 7731681807990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10808225197056).

7731681807990 is an abundant number, since it is smaller than the sum of its proper divisors (13884768586122).

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

7731681807990 is a wasteful number, since it uses less digits than its factorization.

7731681807990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302974.

The product of its (nonzero) digits is 32006016, while the sum is 66.

The spelling of 7731681807990 in words is "seven trillion, seven hundred thirty-one billion, six hundred eighty-one million, eight hundred seven thousand, nine hundred ninety".