990547689 has 8 divisors (see below), whose sum is σ = 1326257280. Its totient is φ = 657601616.

The previous prime is 990547673. The next prime is 990547711. The reversal of 990547689 is 986745099.

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

It is a cyclic number.

It is not a de Polignac number, because 990547689 - 2⁴ = 990547673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (990547639) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 690042 + ... + 691475.

It is an arithmetic number, because the mean of its divisors is an integer number (165782160).

Almost surely, 2^990547689 is an apocalyptic number.

It is an amenable number.

990547689 is a deficient number, since it is larger than the sum of its proper divisors (335709591).

990547689 is a wasteful number, since it uses less digits than its factorization.

990547689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1381759.

The product of its (nonzero) digits is 4898880, while the sum is 57.

The square root of 990547689 is about 31472.9675912520. The cubic root of 990547689 is about 996.8392498508.

The spelling of 990547689 in words is "nine hundred ninety million, five hundred forty-seven thousand, six hundred eighty-nine".