1626664 has 16 divisors (see below), whose sum is σ = 3284820. Its totient is φ = 750720.

The previous prime is 1626649. The next prime is 1626673. The reversal of 1626664 is 4666261.

It can be written as a sum of positive squares in 2 ways, for example, as 1582564 + 44100 = 1258^2 + 210^2 .

It is a super-3 number, since 3×1626664³ = 12912633383926328832, which contains 333 as substring.

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, 7717 + ... + 7924.

2^1626664 is an apocalyptic number.

It is an amenable number.

1626664 is an abundant number, since it is smaller than the sum of its proper divisors (1658156).

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

1626664 is a wasteful number, since it uses less digits than its factorization.

1626664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15660 (or 15656 counting only the distinct ones).

The product of its digits is 10368, while the sum is 31.

The square root of 1626664 is about 1275.4073858968. The cubic root of 1626664 is about 117.6068501416.

It can be divided in two parts, 16 and 26664, that multiplied together give a palindrome (426624).

The spelling of 1626664 in words is "one million, six hundred twenty-six thousand, six hundred sixty-four".