681631378 has 16 divisors (see below), whose sum is σ = 1027128960. Its totient is φ = 339259536.

The previous prime is 681631369. The next prime is 681631387. The reversal of 681631378 is 873136186.

It is an interprime number because it is at equal distance from previous prime (681631369) and next prime (681631387).

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 7 ways as a sum of consecutive naturals, for example, 609676 + ... + 610792.

It is an arithmetic number, because the mean of its divisors is an integer number (64195560).

Almost surely, 2^681631378 is an apocalyptic number.

681631378 is a deficient number, since it is larger than the sum of its proper divisors (345497582).

681631378 is a wasteful number, since it uses less digits than its factorization.

681631378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2241.

The product of its digits is 145152, while the sum is 43.

The square root of 681631378 is about 26108.0711275268. The cubic root of 681631378 is about 880.0685974418.

The spelling of 681631378 in words is "six hundred eighty-one million, six hundred thirty-one thousand, three hundred seventy-eight".