1990056408 has 64 divisors (see below), whose sum is σ = 5185689600. Its totient is φ = 635696640.

The previous prime is 1990056391. The next prime is 1990056413. The reversal of 1990056408 is 8046500991.

It is a self number, because there is not a number n which added to its sum of digits gives 1990056408.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63648 + ... + 89616.

It is an arithmetic number, because the mean of its divisors is an integer number (81026400).

Almost surely, 2^1990056408 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 1990056408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2592844800).

1990056408 is an abundant number, since it is smaller than the sum of its proper divisors (3195633192).

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

1990056408 is a wasteful number, since it uses less digits than its factorization.

1990056408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26112 (or 26108 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 42.

The square root of 1990056408 is about 44610.0482851117. The cubic root of 1990056408 is about 1257.8295564174.

The spelling of 1990056408 in words is "one billion, nine hundred ninety million, fifty-six thousand, four hundred eight".