1681605312 has 28 divisors (see below), whose sum is σ = 4449247896. Its totient is φ = 560535040.

The previous prime is 1681605307. The next prime is 1681605347. The reversal of 1681605312 is 2135061861.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4378989 + ... + 4379372.

Almost surely, 2^1681605312 is an apocalyptic number.

1681605312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1681605312 is an abundant number, since it is smaller than the sum of its proper divisors (2767642584).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1681605312 is an equidigital number, since it uses as much as digits as its factorization.

1681605312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8758376 (or 8758366 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 1681605312 is about 41007.3811892445. The cubic root of 1681605312 is about 1189.1629148239.

The spelling of 1681605312 in words is "one billion, six hundred eighty-one million, six hundred five thousand, three hundred twelve".