989870640 has 160 divisors (see below), whose sum is σ = 3395354112. Its totient is φ = 236544000.

The previous prime is 989870597. The next prime is 989870647. The reversal of 989870640 is 46078989.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (989870647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 184800 + ... + 190080.

Almost surely, 2^989870640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 989870640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1697677056).

989870640 is an abundant number, since it is smaller than the sum of its proper divisors (2405483472).

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

989870640 is a wasteful number, since it uses less digits than its factorization.

989870640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5379 (or 5373 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 51.

The square root of 989870640 is about 31462.2097126060. The cubic root of 989870640 is about 996.6120816380.

The spelling of 989870640 in words is "nine hundred eighty-nine million, eight hundred seventy thousand, six hundred forty".