1664272 has 40 divisors (see below), whose sum is σ = 3437280. Its totient is φ = 779520.

The previous prime is 1664261. The next prime is 1664279. The reversal of 1664272 is 2724661.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1664272.

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, 28179 + ... + 28237.

It is an arithmetic number, because the mean of its divisors is an integer number (85932).

2^1664272 is an apocalyptic number.

It is an amenable number.

1664272 is an abundant number, since it is smaller than the sum of its proper divisors (1773008).

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

1664272 is a wasteful number, since it uses less digits than its factorization.

1664272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151 (or 145 counting only the distinct ones).

The product of its digits is 4032, while the sum is 28.

The square root of 1664272 is about 1290.0666649441. The cubic root of 1664272 is about 118.5062991067.

It can be divided in two parts, 1664 and 272, that added together give a square (1936 = 44²).

The spelling of 1664272 in words is "one million, six hundred sixty-four thousand, two hundred seventy-two".