681372618 has 16 divisors (see below), whose sum is σ = 1368596736. Its totient is φ = 226148960.

The previous prime is 681372607. The next prime is 681372619. The reversal of 681372618 is 816273186.

It is a self number, because there is not a number n which added to its sum of digits gives 681372618.

It is not an unprimeable number, because it can be changed into a prime (681372619) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 242298 + ... + 245093.

It is an arithmetic number, because the mean of its divisors is an integer number (85537296).

Almost surely, 2^681372618 is an apocalyptic number.

681372618 is an abundant number, since it is smaller than the sum of its proper divisors (687224118).

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

681372618 is a wasteful number, since it uses less digits than its factorization.

681372618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487629.

The product of its digits is 96768, while the sum is 42.

The square root of 681372618 is about 26103.1151014587. The cubic root of 681372618 is about 879.9572198556.

The spelling of 681372618 in words is "six hundred eighty-one million, three hundred seventy-two thousand, six hundred eighteen".