1990917674928 has 320 divisors, whose sum is σ = 7061498035200. Its totient is φ = 522982656000.

The previous prime is 1990917674903. The next prime is 1990917674929. The reversal of 1990917674928 is 8294767190991.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is not an unprimeable number, because it can be changed into a prime (1990917674929) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9766428 + ... + 9968196.

It is an arithmetic number, because the mean of its divisors is an integer number (22067181360).

Almost surely, 2^{1990917674928} is an apocalyptic number.

1990917674928 is a gapful number since it is divisible by the number (18) 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 1990917674928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3530749017600).

1990917674928 is an abundant number, since it is smaller than the sum of its proper divisors (5070580360272).

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

1990917674928 is a wasteful number, since it uses less digits than its factorization.

1990917674928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202057 (or 202045 counting only the distinct ones).

The product of its (nonzero) digits is 123451776, while the sum is 72.

The spelling of 1990917674928 in words is "one trillion, nine hundred ninety billion, nine hundred seventeen million, six hundred seventy-four thousand, nine hundred twenty-eight".