681798144 has 40 divisors (see below), whose sum is σ = 1816356960. Its totient is φ = 227265536.

The previous prime is 681798113. The next prime is 681798163. The reversal of 681798144 is 441897186.

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

It is a junction number, because it is equal to n+sod(n) for n = 681798093 and 681798102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220404 + ... + 223475.

It is an arithmetic number, because the mean of its divisors is an integer number (45408924).

Almost surely, 2^681798144 is an apocalyptic number.

681798144 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

681798144 is an abundant number, since it is smaller than the sum of its proper divisors (1134558816).

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

681798144 is an equidigital number, since it uses as much as digits as its factorization.

681798144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443900 (or 443884 counting only the distinct ones).

The product of its digits is 387072, while the sum is 48.

The square root of 681798144 is about 26111.2646955294. The cubic root of 681798144 is about 880.1403632853.

The spelling of 681798144 in words is "six hundred eighty-one million, seven hundred ninety-eight thousand, one hundred forty-four".