681538835 has 8 divisors (see below), whose sum is σ = 860891280. Its totient is φ = 516534624.

The previous prime is 681538799. The next prime is 681538841. The reversal of 681538835 is 538835186.

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 681538835 - 2¹² = 681534739 is a prime.

It is a super-2 number, since 2×681538835² = 928990367226314450, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 681538835.

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, 3586952 + ... + 3587141.

It is an arithmetic number, because the mean of its divisors is an integer number (107611410).

Almost surely, 2^681538835 is an apocalyptic number.

681538835 is a deficient number, since it is larger than the sum of its proper divisors (179352445).

681538835 is a wasteful number, since it uses less digits than its factorization.

681538835 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7174117.

The product of its digits is 691200, while the sum is 47.

The square root of 681538835 is about 26106.2987610270. The cubic root of 681538835 is about 880.0287675685.

The spelling of 681538835 in words is "six hundred eighty-one million, five hundred thirty-eight thousand, eight hundred thirty-five".