981481640 has 64 divisors (see below), whose sum is σ = 2257839360. Its totient is φ = 383891200.

The previous prime is 981481609. The next prime is 981481663. The reversal of 981481640 is 46184189.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 333857 + ... + 336783.

It is an arithmetic number, because the mean of its divisors is an integer number (35278740).

Almost surely, 2^981481640 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 981481640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1128919680).

981481640 is an abundant number, since it is smaller than the sum of its proper divisors (1276357720).

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

981481640 is a wasteful number, since it uses less digits than its factorization.

981481640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3122 (or 3118 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 41.

The square root of 981481640 is about 31328.6073740918. The cubic root of 981481640 is about 993.7887131260.

The spelling of 981481640 in words is "nine hundred eighty-one million, four hundred eighty-one thousand, six hundred forty".