1990706368 has 28 divisors (see below), whose sum is σ = 4514638672. Its totient is φ = 853159680.

The previous prime is 1990706357. The next prime is 1990706369. The reversal of 1990706368 is 8636070991.

It is a tau number, because it is divible by the number of its divisors (28).

It is not an unprimeable number, because it can be changed into a prime (1990706369) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2221323 + ... + 2222218.

Almost surely, 2^1990706368 is an apocalyptic number.

It is an amenable number.

1990706368 is an abundant number, since it is smaller than the sum of its proper divisors (2523932304).

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

1990706368 is an equidigital number, since it uses as much as digits as its factorization.

1990706368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4443560 (or 4443550 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 49.

The square root of 1990706368 is about 44617.3325962008. The cubic root of 1990706368 is about 1257.9664788195.

The spelling of 1990706368 in words is "one billion, nine hundred ninety million, seven hundred six thousand, three hundred sixty-eight".