981680 has 40 divisors (see below), whose sum is σ = 2609952. Its totient is φ = 336384.

The previous prime is 981653. The next prime is 981683. The reversal of 981680 is 86189.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (981683) by changing a digit.

981680 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 317 + ... + 1436.

2⁹⁸¹⁶⁸⁰ is an apocalyptic number.

It is an amenable number.

981680 is an abundant number, since it is smaller than the sum of its proper divisors (1628272).

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

981680 is a wasteful number, since it uses less digits than its factorization.

981680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1773 (or 1767 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 981680 is about 990.7976584550. The cubic root of 981680 is about 99.3855657714.

It can be divided in two parts, 981 and 680, that added together give a palindrome (1661).

The spelling of 981680 in words is "nine hundred eighty-one thousand, six hundred eighty".