687041990 has 16 divisors (see below), whose sum is σ = 1237345200. Its totient is φ = 274668000.

The previous prime is 687041989. The next prime is 687042007. The reversal of 687041990 is 99140786.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 1865 + ... + 37115.

It is an arithmetic number, because the mean of its divisors is an integer number (77334075).

Almost surely, 2^687041990 is an apocalyptic number.

687041990 is a deficient number, since it is larger than the sum of its proper divisors (550303210).

687041990 is a wasteful number, since it uses less digits than its factorization.

687041990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37207.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 687041990 is about 26211.4858411346. The cubic root of 687041990 is about 882.3910481904.

The spelling of 687041990 in words is "six hundred eighty-seven million, forty-one thousand, nine hundred ninety".