681890035 has 8 divisors (see below), whose sum is σ = 829793376. Its totient is φ = 537828480.

The previous prime is 681890029. The next prime is 681890063. The reversal of 681890035 is 530098186.

It is a happy number.

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

It is not a de Polignac number, because 681890035 - 2⁵ = 681890003 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 681890035.

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, 960054 + ... + 960763.

It is an arithmetic number, because the mean of its divisors is an integer number (103724172).

Almost surely, 2^681890035 is an apocalyptic number.

681890035 is a deficient number, since it is larger than the sum of its proper divisors (147903341).

681890035 is a wasteful number, since it uses less digits than its factorization.

681890035 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1920893.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 681890035 is about 26113.0242407884. The cubic root of 681890035 is about 880.1799025270.

The spelling of 681890035 in words is "six hundred eighty-one million, eight hundred ninety thousand, thirty-five".