1681375488 has 144 divisors (see below), whose sum is σ = 4879600320. Its totient is φ = 510861312.

The previous prime is 1681375471. The next prime is 1681375499. The reversal of 1681375488 is 8845731861.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1681375488.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 827658 + ... + 829686.

Almost surely, 2^1681375488 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 1681375488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2439800160).

1681375488 is an abundant number, since it is smaller than the sum of its proper divisors (3198224832).

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

1681375488 is a wasteful number, since it uses less digits than its factorization.

1681375488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2144 (or 2130 counting only the distinct ones).

The product of its digits is 1290240, while the sum is 51.

The square root of 1681375488 is about 41004.5788662681. The cubic root of 1681375488 is about 1189.1087382924.

The spelling of 1681375488 in words is "one billion, six hundred eighty-one million, three hundred seventy-five thousand, four hundred eighty-eight".