681145968 has 40 divisors (see below), whose sum is σ = 1820307600. Its totient is φ = 219218944.

The previous prime is 681145921. The next prime is 681145999. The reversal of 681145968 is 869541186.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 243273 + ... + 246056.

It is an arithmetic number, because the mean of its divisors is an integer number (45507690).

Almost surely, 2^681145968 is an apocalyptic number.

It is an amenable number.

681145968 is an abundant number, since it is smaller than the sum of its proper divisors (1139161632).

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

681145968 is a wasteful number, since it uses less digits than its factorization.

681145968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489369 (or 489363 counting only the distinct ones).

The product of its digits is 414720, while the sum is 48.

The square root of 681145968 is about 26098.7733045061. The cubic root of 681145968 is about 879.8596401483.

The spelling of 681145968 in words is "six hundred eighty-one million, one hundred forty-five thousand, nine hundred sixty-eight".