1683888640 has 80 divisors (see below), whose sum is σ = 4614204672. Its totient is φ = 577327104.

The previous prime is 1683888637. The next prime is 1683888649. The reversal of 1683888640 is 468883861.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (1683888649) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 29064 + ... + 64903.

Almost surely, 2^1683888640 is an apocalyptic number.

1683888640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1683888640 is an abundant number, since it is smaller than the sum of its proper divisors (2930316032).

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

1683888640 is an frugal number, since it uses more digits than its factorization.

1683888640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93997 (or 93981 counting only the distinct ones).

The product of its (nonzero) digits is 1769472, while the sum is 52.

The square root of 1683888640 is about 41035.2121963564. The cubic root of 1683888640 is about 1189.7008969812.

The spelling of 1683888640 in words is "one billion, six hundred eighty-three million, eight hundred eighty-eight thousand, six hundred forty".