681535488 has 48 divisors (see below), whose sum is σ = 1817000640. Its totient is φ = 227176448.

The previous prime is 681535469. The next prime is 681535489. The reversal of 681535488 is 884535186.

It is a tau number, because it is divible by the number of its divisors (48).

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

It is not an unprimeable number, because it can be changed into a prime (681535489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49320 + ... + 61607.

It is an arithmetic number, because the mean of its divisors is an integer number (37854180).

Almost surely, 2^681535488 is an apocalyptic number.

It is an amenable number.

681535488 is an abundant number, since it is smaller than the sum of its proper divisors (1135465152).

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

681535488 is a wasteful number, since it uses less digits than its factorization.

681535488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110952 (or 110932 counting only the distinct ones).

The product of its digits is 921600, while the sum is 48.

The square root of 681535488 is about 26106.2346576445. The cubic root of 681535488 is about 880.0273269751.

The spelling of 681535488 in words is "six hundred eighty-one million, five hundred thirty-five thousand, four hundred eighty-eight".