1685680990 has 32 divisors (see below), whose sum is σ = 3481216704. Its totient is φ = 575692800.

The previous prime is 1685680987. The next prime is 1685681021. The reversal of 1685680990 is 990865861.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28861 + ... + 64840.

It is an arithmetic number, because the mean of its divisors is an integer number (108788022).

Almost surely, 2^1685680990 is an apocalyptic number.

1685680990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1685680990 is an abundant number, since it is smaller than the sum of its proper divisors (1795535714).

1685680990 is a wasteful number, since it uses less digits than its factorization.

1685680990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93972.

The product of its (nonzero) digits is 933120, while the sum is 52.

The square root of 1685680990 is about 41057.0455585884. The cubic root of 1685680990 is about 1190.1228576401.

The spelling of 1685680990 in words is "one billion, six hundred eighty-five million, six hundred eighty thousand, nine hundred ninety".