681670142 has 16 divisors (see below), whose sum is σ = 1047987072. Its totient is φ = 332367000.

The previous prime is 681670133. The next prime is 681670147. The reversal of 681670142 is 241076186.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681670147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49517 + ... + 61767.

It is an arithmetic number, because the mean of its divisors is an integer number (65499192).

Almost surely, 2^681670142 is an apocalyptic number.

681670142 is a deficient number, since it is larger than the sum of its proper divisors (366316930).

681670142 is a wasteful number, since it uses less digits than its factorization.

681670142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12943.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 681670142 is about 26108.8134927652. The cubic root of 681670142 is about 880.0852801306.

The spelling of 681670142 in words is "six hundred eighty-one million, six hundred seventy thousand, one hundred forty-two".