1678664 has 16 divisors (see below), whose sum is σ = 3389820. Its totient is φ = 774720.

The previous prime is 1678657. The next prime is 1678673. The reversal of 1678664 is 4668761.

It can be written as a sum of positive squares in 2 ways, for example, as 1582564 + 96100 = 1258^2 + 310^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7967 + ... + 8174.

2^1678664 is an apocalyptic number.

It is an amenable number.

1678664 is an abundant number, since it is smaller than the sum of its proper divisors (1711156).

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

1678664 is a wasteful number, since it uses less digits than its factorization.

1678664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16160 (or 16156 counting only the distinct ones).

The product of its digits is 48384, while the sum is 38.

The square root of 1678664 is about 1295.6326639908. The cubic root of 1678664 is about 118.8469184772.

The spelling of 1678664 in words is "one million, six hundred seventy-eight thousand, six hundred sixty-four".