1990847766 has 8 divisors (see below), whose sum is σ = 3981695544. Its totient is φ = 663615920.

The previous prime is 1990847743. The next prime is 1990847801. The reversal of 1990847766 is 6677480991.

It is a sphenic number, since it is the product of 3 distinct primes.

1990847766 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 165903975 + ... + 165903986.

It is an arithmetic number, because the mean of its divisors is an integer number (497711943).

Almost surely, 2^1990847766 is an apocalyptic number.

1990847766 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1990847766 is a wasteful number, since it uses less digits than its factorization.

1990847766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331807966.

The product of its (nonzero) digits is 4572288, while the sum is 57.

The square root of 1990847766 is about 44618.9171316382. The cubic root of 1990847766 is about 1257.9962621727.

The spelling of 1990847766 in words is "one billion, nine hundred ninety million, eight hundred forty-seven thousand, seven hundred sixty-six".