1553664 has 108 divisors (see below), whose sum is σ = 5020064. Its totient is φ = 417792.

The previous prime is 1553653. The next prime is 1553701. The reversal of 1553664 is 4663551.

Its product of digits (10800) is a multiple of the sum of its prime factors (60).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 91384 + ... + 91400.

2^1553664 is an apocalyptic number.

1553664 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1553664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2510032).

1553664 is an abundant number, since it is smaller than the sum of its proper divisors (3466400).

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

1553664 is an equidigital number, since it uses as much as digits as its factorization.

1553664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60 (or 29 counting only the distinct ones).

The product of its digits is 10800, while the sum is 30.

The square root of 1553664 is about 1246.4605890280. The cubic root of 1553664 is about 115.8205707980.

The spelling of 1553664 in words is "one million, five hundred fifty-three thousand, six hundred sixty-four".