1687878444 has 24 divisors (see below), whose sum is σ = 4501009408. Its totient is φ = 482250960.

The previous prime is 1687878443. The next prime is 1687878461. The reversal of 1687878444 is 4448787861.

It is a super-2 number, since 2×1687878444² = 5697867283439722272, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1687878443) by changing a digit.

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, 10046812 + ... + 10046979.

Almost surely, 2^1687878444 is an apocalyptic number.

1687878444 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1687878444 is an abundant number, since it is smaller than the sum of its proper divisors (2813130964).

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

1687878444 is a wasteful number, since it uses less digits than its factorization.

1687878444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20093805 (or 20093803 counting only the distinct ones).

The product of its digits is 9633792, while the sum is 57.

The square root of 1687878444 is about 41083.7978283410. The cubic root of 1687878444 is about 1190.6397811985.

The spelling of 1687878444 in words is "one billion, six hundred eighty-seven million, eight hundred seventy-eight thousand, four hundred forty-four".