1681939064 has 64 divisors (see below), whose sum is σ = 3683867040. Its totient is φ = 712765440.

The previous prime is 1681939037. The next prime is 1681939087. The reversal of 1681939064 is 4609391861.

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, 60887 + ... + 84089.

Almost surely, 2^1681939064 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1681939064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1841933520).

1681939064 is an abundant number, since it is smaller than the sum of its proper divisors (2001927976).

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

1681939064 is a wasteful number, since it uses less digits than its factorization.

1681939064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23280 (or 23276 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 47.

The square root of 1681939064 is about 41011.4504010770. The cubic root of 1681939064 is about 1189.2415815685.

The spelling of 1681939064 in words is "one billion, six hundred eighty-one million, nine hundred thirty-nine thousand, sixty-four".