681389982 has 288 divisors, whose sum is σ = 2007742464. Its totient is φ = 171460800.

The previous prime is 681389981. The next prime is 681389987. The reversal of 681389982 is 289983186.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681389981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 9597007 + ... + 9597077.

It is an arithmetic number, because the mean of its divisors is an integer number (6971328).

Almost surely, 2^681389982 is an apocalyptic number.

681389982 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 681389982, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1003871232).

681389982 is an abundant number, since it is smaller than the sum of its proper divisors (1326352482).

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

681389982 is a wasteful number, since it uses less digits than its factorization.

681389982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146 (or 127 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 54.

The square root of 681389982 is about 26103.4477033207. The cubic root of 681389982 is about 879.9646946924.

The spelling of 681389982 in words is "six hundred eighty-one million, three hundred eighty-nine thousand, nine hundred eighty-two".