681550608 has 40 divisors (see below), whose sum is σ = 1780466400. Its totient is φ = 224629504.

The previous prime is 681550601. The next prime is 681550609. The reversal of 681550608 is 806055186.

It is a super-2 number, since 2×681550608² = 929022462530339328, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (681550601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75498 + ... + 84041.

It is an arithmetic number, because the mean of its divisors is an integer number (44511660).

Almost surely, 2^681550608 is an apocalyptic number.

It is an amenable number.

681550608 is an abundant number, since it is smaller than the sum of its proper divisors (1098915792).

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

681550608 is a wasteful number, since it uses less digits than its factorization.

681550608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159639 (or 159633 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 39.

The square root of 681550608 is about 26106.5242420357. The cubic root of 681550608 is about 880.0338347872.

The spelling of 681550608 in words is "six hundred eighty-one million, five hundred fifty thousand, six hundred eight".