1681900280 has 32 divisors (see below), whose sum is σ = 3872286000. Its totient is φ = 657113856.

The previous prime is 1681900279. The next prime is 1681900301. The reversal of 1681900280 is 820091861.

It is a self number, because there is not a number n which added to its sum of digits gives 1681900280.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 487205 + ... + 490644.

Almost surely, 2^1681900280 is an apocalyptic number.

1681900280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1681900280 is an abundant number, since it is smaller than the sum of its proper divisors (2190385720).

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

1681900280 is a wasteful number, since it uses less digits than its factorization.

1681900280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 977903 (or 977899 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 35.

The square root of 1681900280 is about 41010.9775547962. The cubic root of 1681900280 is about 1189.2324405517.

The spelling of 1681900280 in words is "one billion, six hundred eighty-one million, nine hundred thousand, two hundred eighty".