981838578 has 24 divisors (see below), whose sum is σ = 2284278192. Its totient is φ = 280525224.

The previous prime is 981838577. The next prime is 981838589. The reversal of 981838578 is 875838189.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (981838573) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1669500 + ... + 1670087.

It is an arithmetic number, because the mean of its divisors is an integer number (95178258).

Almost surely, 2^981838578 is an apocalyptic number.

981838578 is a gapful number since it is divisible by the number (98) formed by its first and last digit.

981838578 is an abundant number, since it is smaller than the sum of its proper divisors (1302439614).

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

981838578 is a wasteful number, since it uses less digits than its factorization.

981838578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3339606 (or 3339599 counting only the distinct ones).

The product of its digits is 3870720, while the sum is 57.

The square root of 981838578 is about 31334.3035346248. The cubic root of 981838578 is about 993.9091697735.

The spelling of 981838578 in words is "nine hundred eighty-one million, eight hundred thirty-eight thousand, five hundred seventy-eight".