1678656 has 56 divisors (see below), whose sum is σ = 5080000. Its totient is φ = 479232.

The previous prime is 1678639. The next prime is 1678657. The reversal of 1678656 is 6568761.

It is a tau number, because it is divible by the number of its divisors (56).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1678657) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 720 + ... + 1968.

2^1678656 is an apocalyptic number.

1678656 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 1678656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2540000).

1678656 is an abundant number, since it is smaller than the sum of its proper divisors (3401344).

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

1678656 is a wasteful number, since it uses less digits than its factorization.

1678656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1271 (or 1261 counting only the distinct ones).

The product of its digits is 60480, while the sum is 39.

The square root of 1678656 is about 1295.6295766924. The cubic root of 1678656 is about 118.8467296808.

The spelling of 1678656 in words is "one million, six hundred seventy-eight thousand, six hundred fifty-six".