681386244 has 48 divisors (see below), whose sum is σ = 1982217216. Its totient is φ = 176983200.

The previous prime is 681386183. The next prime is 681386263. The reversal of 681386244 is 442683186.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 681386196 and 681386205.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 367792 + ... + 369639.

It is an arithmetic number, because the mean of its divisors is an integer number (41296192).

Almost surely, 2^681386244 is an apocalyptic number.

It is an amenable number.

681386244 is an abundant number, since it is smaller than the sum of its proper divisors (1300830972).

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

681386244 is a wasteful number, since it uses less digits than its factorization.

681386244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 737456 (or 737454 counting only the distinct ones).

The product of its digits is 221184, while the sum is 42.

The square root of 681386244 is about 26103.3761034852. The cubic root of 681386244 is about 879.9630855727.

The spelling of 681386244 in words is "six hundred eighty-one million, three hundred eighty-six thousand, two hundred forty-four".