1667616 has 48 divisors (see below), whose sum is σ = 4536000. Its totient is φ = 535808.

The previous prime is 1667609. The next prime is 1667623. The reversal of 1667616 is 6167661.

It is an interprime number because it is at equal distance from previous prime (1667609) and next prime (1667623).

It is a tau number, because it is divible by the number of its divisors (48).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2485 + ... + 3083.

It is an arithmetic number, because the mean of its divisors is an integer number (94500).

2^1667616 is an apocalyptic number.

1667616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1667616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2268000).

1667616 is an abundant number, since it is smaller than the sum of its proper divisors (2868384).

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

1667616 is a wasteful number, since it uses less digits than its factorization.

1667616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 641 (or 633 counting only the distinct ones).

The product of its digits is 9072, while the sum is 33.

The square root of 1667616 is about 1291.3620716128. The cubic root of 1667616 is about 118.5856170594.

The spelling of 1667616 in words is "one million, six hundred sixty-seven thousand, six hundred sixteen".