690581693 has 4 divisors (see below), whose sum is σ = 720607008. Its totient is φ = 660556380.

The previous prime is 690581659. The next prime is 690581707. The reversal of 690581693 is 396185096.

690581693 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 690581693 - 2⁶ = 690581629 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690581623) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15012623 + ... + 15012668.

It is an arithmetic number, because the mean of its divisors is an integer number (180151752).

Almost surely, 2^690581693 is an apocalyptic number.

It is an amenable number.

690581693 is a deficient number, since it is larger than the sum of its proper divisors (30025315).

690581693 is a wasteful number, since it uses less digits than its factorization.

690581693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30025314.

The product of its (nonzero) digits is 349920, while the sum is 47.

The square root of 690581693 is about 26278.9210775481. The cubic root of 690581693 is about 883.9038395330.

The spelling of 690581693 in words is "six hundred ninety million, five hundred eighty-one thousand, six hundred ninety-three".