1664270 has 16 divisors (see below), whose sum is σ = 3060288. Its totient is φ = 651360.

The previous prime is 1664261. The next prime is 1664279. The reversal of 1664270 is 724661.

It is an interprime number because it is at equal distance from previous prime (1664261) and next prime (1664279).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664279) 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, 1301 + ... + 2240.

It is an arithmetic number, because the mean of its divisors is an integer number (191268).

2^1664270 is an apocalyptic number.

1664270 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1664270 is a deficient number, since it is larger than the sum of its proper divisors (1396018).

1664270 is a wasteful number, since it uses less digits than its factorization.

1664270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3595.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 1664270 is about 1290.0658897901. The cubic root of 1664270 is about 118.5062516360.

The spelling of 1664270 in words is "one million, six hundred sixty-four thousand, two hundred seventy".