1625664 has 28 divisors (see below), whose sum is σ = 4301744. Its totient is φ = 541824.

The previous prime is 1625647. The next prime is 1625677. The reversal of 1625664 is 4665261.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

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, 4042 + ... + 4425.

2^1625664 is an apocalyptic number.

It is an amenable number.

1625664 is an abundant number, since it is smaller than the sum of its proper divisors (2676080).

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

1625664 is an equidigital number, since it uses as much as digits as its factorization.

1625664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8482 (or 8472 counting only the distinct ones).

The product of its digits is 8640, while the sum is 30.

The square root of 1625664 is about 1275.0152940259. The cubic root of 1625664 is about 117.5827453976.

The spelling of 1625664 in words is "one million, six hundred twenty-five thousand, six hundred sixty-four".