990071789 has 16 divisors (see below), whose sum is σ = 1230455808. Its totient is φ = 777123072.

The previous prime is 990071767. The next prime is 990071801. The reversal of 990071789 is 987170099.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-990071789 is a prime.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990071989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108029 + ... + 116834.

It is an arithmetic number, because the mean of its divisors is an integer number (76903488).

Almost surely, 2^990071789 is an apocalyptic number.

It is an amenable number.

990071789 is a deficient number, since it is larger than the sum of its proper divisors (240384019).

990071789 is a wasteful number, since it uses less digits than its factorization.

990071789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224924.

The product of its (nonzero) digits is 285768, while the sum is 50.

The square root of 990071789 is about 31465.4062265212. The cubic root of 990071789 is about 996.6795833694.

The spelling of 990071789 in words is "nine hundred ninety million, seventy-one thousand, seven hundred eighty-nine".