1687814380 has 48 divisors (see below), whose sum is σ = 4053159936. Its totient is φ = 578335680.

The previous prime is 1687814351. The next prime is 1687814411. The reversal of 1687814380 is 834187861.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1687814380.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 377317 + ... + 381763.

It is an arithmetic number, because the mean of its divisors is an integer number (84440832).

Almost surely, 2^1687814380 is an apocalyptic number.

1687814380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1687814380 is an abundant number, since it is smaller than the sum of its proper divisors (2365345556).

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

1687814380 is a wasteful number, since it uses less digits than its factorization.

1687814380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7174 (or 7172 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 46.

The square root of 1687814380 is about 41083.0181461878. The cubic root of 1687814380 is about 1190.6247172954.

The spelling of 1687814380 in words is "one billion, six hundred eighty-seven million, eight hundred fourteen thousand, three hundred eighty".