981381280 has 96 divisors (see below), whose sum is σ = 2538708480. Its totient is φ = 355537920.

The previous prime is 981381263. The next prime is 981381311. The reversal of 981381280 is 82183189.

981381280 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 557041 + ... + 558799.

It is an arithmetic number, because the mean of its divisors is an integer number (26444880).

Almost surely, 2^981381280 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 981381280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1269354240).

981381280 is an abundant number, since it is smaller than the sum of its proper divisors (1557327200).

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

981381280 is a wasteful number, since it uses less digits than its factorization.

981381280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2102 (or 2094 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 40.

The square root of 981381280 is about 31327.0056021957. The cubic root of 981381280 is about 993.7548391574.

The spelling of 981381280 in words is "nine hundred eighty-one million, three hundred eighty-one thousand, two hundred eighty".