681607405 has 8 divisors (see below), whose sum is σ = 836950752. Its totient is φ = 532604688.

The previous prime is 681607403. The next prime is 681607429. The reversal of 681607405 is 504706186.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 681607405 - 2¹ = 681607403 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681607403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1584919 + ... + 1585348.

It is an arithmetic number, because the mean of its divisors is an integer number (104618844).

Almost surely, 2^681607405 is an apocalyptic number.

It is an amenable number.

681607405 is a deficient number, since it is larger than the sum of its proper divisors (155343347).

681607405 is a wasteful number, since it uses less digits than its factorization.

681607405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3170315.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 681607405 is about 26107.6120125913. The cubic root of 681607405 is about 880.0582799728.

The spelling of 681607405 in words is "six hundred eighty-one million, six hundred seven thousand, four hundred five".