985121280 has 720 divisors, whose sum is σ = 4205462976. Its totient is φ = 210862080.

The previous prime is 985121201. The next prime is 985121323. The reversal of 985121280 is 82121589.

It is a tau number, because it is divible by the number of its divisors (720).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 42831349 + ... + 42831371.

Almost surely, 2^985121280 is an apocalyptic number.

985121280 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 985121280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2102731488).

985121280 is an abundant number, since it is smaller than the sum of its proper divisors (3220341696).

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

985121280 is a wasteful number, since it uses less digits than its factorization.

985121280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89 (or 57 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 36.

The square root of 985121280 is about 31386.6417445384. The cubic root of 985121280 is about 995.0156239392.

It can be divided in two parts, 985 and 121280, that added together give a triangular number (122265 = T₄₉₄).

The spelling of 985121280 in words is "nine hundred eighty-five million, one hundred twenty-one thousand, two hundred eighty".