1988769685812 has 384 divisors, whose sum is σ = 5965677527040. Its totient is φ = 501531125760.

The previous prime is 1988769685811. The next prime is 1988769685907. The reversal of 1988769685812 is 2185869678891.

It is a super-2 number, since 2×1988769685812² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (78).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1988769685811) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1675458283 + ... + 1675459469.

It is an arithmetic number, because the mean of its divisors is an integer number (15535618560).

Almost surely, 2^{1988769685812} is an apocalyptic number.

1988769685812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1988769685812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2982838763520).

1988769685812 is an abundant number, since it is smaller than the sum of its proper divisors (3976907841228).

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

1988769685812 is a wasteful number, since it uses less digits than its factorization.

1988769685812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1711 (or 1709 counting only the distinct ones).

The product of its digits is 836075520, while the sum is 78.

The spelling of 1988769685812 in words is "one trillion, nine hundred eighty-eight billion, seven hundred sixty-nine million, six hundred eighty-five thousand, eight hundred twelve".