1990264995840 has 1440 divisors, whose sum is σ = 7711378440192. Its totient is φ = 435997900800.

The previous prime is 1990264995791. The next prime is 1990264995877. The reversal of 1990264995840 is 485994620991.

It is a super-2 number, since 2×1990264995840² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 15671377857 + ... + 15671377983.

Almost surely, 2^{1990264995840} is an apocalyptic number.

1990264995840 is a gapful number since it is divisible by the number (10) 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 1990264995840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3855689220096).

1990264995840 is an abundant number, since it is smaller than the sum of its proper divisors (5721113444352).

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

1990264995840 is a wasteful number, since it uses less digits than its factorization.

1990264995840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233 (or 196 counting only the distinct ones).

The product of its (nonzero) digits is 50388480, while the sum is 66.

The spelling of 1990264995840 in words is "one trillion, nine hundred ninety billion, two hundred sixty-four million, nine hundred ninety-five thousand, eight hundred forty".