981481578 has 96 divisors (see below), whose sum is σ = 2484142080. Its totient is φ = 253044000.

The previous prime is 981481561. The next prime is 981481601. The reversal of 981481578 is 875184189.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 981481578.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 766743 + ... + 768021.

It is an arithmetic number, because the mean of its divisors is an integer number (25876480).

Almost surely, 2^981481578 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 981481578, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1242071040).

981481578 is an abundant number, since it is smaller than the sum of its proper divisors (1502660502).

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

981481578 is a wasteful number, since it uses less digits than its factorization.

981481578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1464 (or 1453 counting only the distinct ones).

The product of its digits is 645120, while the sum is 51.

The square root of 981481578 is about 31328.6063845809. The cubic root of 981481578 is about 993.7886922002.

The spelling of 981481578 in words is "nine hundred eighty-one million, four hundred eighty-one thousand, five hundred seventy-eight".