1681878416 has 10 divisors (see below), whose sum is σ = 3258639462. Its totient is φ = 840939200.

The previous prime is 1681878379. The next prime is 1681878431. The reversal of 1681878416 is 6148781861.

It can be written as a sum of positive squares in only one way, i.e., 1369296016 + 312582400 = 37004^2 + 17680^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52558685 + ... + 52558716.

Almost surely, 2^1681878416 is an apocalyptic number.

1681878416 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1681878416 is a deficient number, since it is larger than the sum of its proper divisors (1576761046).

1681878416 is a wasteful number, since it uses less digits than its factorization.

1681878416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105117409 (or 105117403 counting only the distinct ones).

The product of its digits is 516096, while the sum is 50.

The square root of 1681878416 is about 41010.7109911545. The cubic root of 1681878416 is about 1189.2272873546.

The spelling of 1681878416 in words is "one billion, six hundred eighty-one million, eight hundred seventy-eight thousand, four hundred sixteen".