684742090 has 16 divisors (see below), whose sum is σ = 1242243072. Its totient is φ = 271739664.

The previous prime is 684742087. The next prime is 684742111. The reversal of 684742090 is 90247486.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 268314 + ... + 270853.

It is an arithmetic number, because the mean of its divisors is an integer number (77640192).

Almost surely, 2^684742090 is an apocalyptic number.

684742090 is a deficient number, since it is larger than the sum of its proper divisors (557500982).

684742090 is a wasteful number, since it uses less digits than its factorization.

684742090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 539301.

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 684742090 is about 26167.5770754573. The cubic root of 684742090 is about 881.4053345885.

The spelling of 684742090 in words is "six hundred eighty-four million, seven hundred forty-two thousand, ninety".