681782542 has 32 divisors (see below), whose sum is σ = 1194298560. Its totient is φ = 285880320.

The previous prime is 681782509. The next prime is 681782573. The reversal of 681782542 is 245287186.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 118042 + ... + 123682.

It is an arithmetic number, because the mean of its divisors is an integer number (37321830).

Almost surely, 2^681782542 is an apocalyptic number.

681782542 is a deficient number, since it is larger than the sum of its proper divisors (512516018).

681782542 is a wasteful number, since it uses less digits than its factorization.

681782542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5836.

The product of its digits is 215040, while the sum is 43.

The square root of 681782542 is about 26110.9659338754. The cubic root of 681782542 is about 880.1336496390.

The spelling of 681782542 in words is "six hundred eighty-one million, seven hundred eighty-two thousand, five hundred forty-two".