1990708633 has 4 divisors (see below), whose sum is σ = 1990813968. Its totient is φ = 1990603300.

The previous prime is 1990708631. The next prime is 1990708649. The reversal of 1990708633 is 3368070991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1990708633 - 2¹ = 1990708631 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1990708631) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 15643 + ... + 65008.

It is an arithmetic number, because the mean of its divisors is an integer number (497703492).

Almost surely, 2^1990708633 is an apocalyptic number.

It is an amenable number.

1990708633 is a deficient number, since it is larger than the sum of its proper divisors (105335).

1990708633 is an equidigital number, since it uses as much as digits as its factorization.

1990708633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105334.

The product of its (nonzero) digits is 244944, while the sum is 46.

The square root of 1990708633 is about 44617.3579787060. The cubic root of 1990708633 is about 1257.9669559186.

The spelling of 1990708633 in words is "one billion, nine hundred ninety million, seven hundred eight thousand, six hundred thirty-three".