689785064090 has 64 divisors (see below), whose sum is σ = 1312097473440. Its totient is φ = 260783078400.

The previous prime is 689785064081. The next prime is 689785064123. The reversal of 689785064090 is 90460587986.

It is a Cunningham number, because it is equal to 830533²+1.

It can be written as a sum of positive squares in 16 ways, for example, as 649721438809 + 40063625281 = 806053^2 + 200159^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1806476 + ... + 2154744.

Almost surely, 2^689785064090 is an apocalyptic number.

689785064090 is a deficient number, since it is larger than the sum of its proper divisors (622312409350).

689785064090 is a wasteful number, since it uses less digits than its factorization.

689785064090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348467.

The product of its (nonzero) digits is 26127360, while the sum is 62.

The spelling of 689785064090 in words is "six hundred eighty-nine billion, seven hundred eighty-five million, sixty-four thousand, ninety".