681745248 has 144 divisors (see below), whose sum is σ = 2039755536. Its totient is φ = 223948800.

The previous prime is 681745223. The next prime is 681745249. The reversal of 681745248 is 842547186.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681745249) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 567048 + ... + 568248.

It is an arithmetic number, because the mean of its divisors is an integer number (14164969).

Almost surely, 2^681745248 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 681745248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1019877768).

681745248 is an abundant number, since it is smaller than the sum of its proper divisors (1358010288).

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

681745248 is a wasteful number, since it uses less digits than its factorization.

681745248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1299 (or 1279 counting only the distinct ones).

The product of its digits is 430080, while the sum is 45.

The square root of 681745248 is about 26110.2517797129. The cubic root of 681745248 is about 880.1176013632.

The spelling of 681745248 in words is "six hundred eighty-one million, seven hundred forty-five thousand, two hundred forty-eight".