681647210 has 16 divisors (see below), whose sum is σ = 1229600736. Its totient is φ = 272073168.

The previous prime is 681647207. The next prime is 681647261. The reversal of 681647210 is 12746186.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68312 + ... + 77651.

It is an arithmetic number, because the mean of its divisors is an integer number (76850046).

Almost surely, 2^681647210 is an apocalyptic number.

681647210 is a deficient number, since it is larger than the sum of its proper divisors (547953526).

681647210 is a wasteful number, since it uses less digits than its factorization.

681647210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146437.

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

The square root of 681647210 is about 26108.3743270239. The cubic root of 681647210 is about 880.0754110651.

The spelling of 681647210 in words is "six hundred eighty-one million, six hundred forty-seven thousand, two hundred ten".