1687616 has 28 divisors (see below), whose sum is σ = 3828288. Its totient is φ = 723072.

The previous prime is 1687613. The next prime is 1687627. The reversal of 1687616 is 6167861.

It is a tau number, because it is divible by the number of its divisors (28).

It is not an unprimeable number, because it can be changed into a prime (1687613) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1436 + ... + 2331.

2^1687616 is an apocalyptic number.

1687616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1687616 is an abundant number, since it is smaller than the sum of its proper divisors (2140672).

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

1687616 is an equidigital number, since it uses as much as digits as its factorization.

1687616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3786 (or 3776 counting only the distinct ones).

The product of its digits is 12096, while the sum is 35.

The square root of 1687616 is about 1299.0827533302. The cubic root of 1687616 is about 119.0578068132.

It can be divided in two parts, 16 and 87616, that multiplied together give a square (1401856 = 1184²).

The spelling of 1687616 in words is "one million, six hundred eighty-seven thousand, six hundred sixteen".