989557650 has 72 divisors (see below), whose sum is σ = 2665917540. Its totient is φ = 263157120.

The previous prime is 989557631. The next prime is 989557663. The reversal of 989557650 is 56755989.

It is a happy number.

989557650 is a `hidden beast` number, since 9 + 89 + 557 + 6 + 5 + 0 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 367603929 + 621953721 = 19173^2 + 24939^2 .

It is an unprimeable number.

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 35 ways as a sum of consecutive naturals, for example, 172224 + ... + 177876.

Almost surely, 2^989557650 is an apocalyptic number.

989557650 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 989557650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1332958770).

989557650 is an abundant number, since it is smaller than the sum of its proper divisors (1676359890).

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

989557650 is a wasteful number, since it uses less digits than its factorization.

989557650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6060 (or 6052 counting only the distinct ones).

The product of its (nonzero) digits is 3402000, while the sum is 54.

The square root of 989557650 is about 31457.2352567736. The cubic root of 989557650 is about 996.5070300332.

The spelling of 989557650 in words is "nine hundred eighty-nine million, five hundred fifty-seven thousand, six hundred fifty".