691760890 has 16 divisors (see below), whose sum is σ = 1245533832. Its totient is φ = 276623424.

The previous prime is 691760837. The next prime is 691760947. The reversal of 691760890 is 98067196.

It can be written as a sum of positive squares in 4 ways, for example, as 631868769 + 59892121 = 25137^2 + 7739^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 691760890.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35632 + ... + 51508.

Almost surely, 2^691760890 is an apocalyptic number.

691760890 is a deficient number, since it is larger than the sum of its proper divisors (553772942).

691760890 is a wasteful number, since it uses less digits than its factorization.

691760890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20241.

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 691760890 is about 26301.3476841017. The cubic root of 691760890 is about 884.4066543211.

The spelling of 691760890 in words is "six hundred ninety-one million, seven hundred sixty thousand, eight hundred ninety".