681243528 has 32 divisors (see below), whose sum is σ = 1946410560. Its totient is φ = 194640960.

The previous prime is 681243527. The next prime is 681243557. The reversal of 681243528 is 825342186.

It is not an unprimeable number, because it can be changed into a prime (681243527) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2027343 + ... + 2027678.

It is an arithmetic number, because the mean of its divisors is an integer number (60825330).

Almost surely, 2^681243528 is an apocalyptic number.

It is an amenable number.

681243528 is an abundant number, since it is smaller than the sum of its proper divisors (1265167032).

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

681243528 is a wasteful number, since it uses less digits than its factorization.

681243528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4055037 (or 4055033 counting only the distinct ones).

The product of its digits is 92160, while the sum is 39.

The square root of 681243528 is about 26100.6422909476. The cubic root of 681243528 is about 879.9016453437.

The spelling of 681243528 in words is "six hundred eighty-one million, two hundred forty-three thousand, five hundred twenty-eight".