1662656 has 28 divisors (see below), whose sum is σ = 3349752. Its totient is φ = 818688.

The previous prime is 1662653. The next prime is 1662667. The reversal of 1662656 is 6562661.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1662653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5156 + ... + 5468.

It is an arithmetic number, because the mean of its divisors is an integer number (119634).

2^1662656 is an apocalyptic number.

1662656 is a gapful number since it is divisible by the number (16) 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 1662656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1674876).

1662656 is an abundant number, since it is smaller than the sum of its proper divisors (1687096).

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

1662656 is an equidigital number, since it uses as much as digits as its factorization.

1662656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408 (or 398 counting only the distinct ones).

The product of its digits is 12960, while the sum is 32.

The square root of 1662656 is about 1289.4401886090. The cubic root of 1662656 is about 118.4679303391.

It can be divided in two parts, 166 and 2656, that multiplied together give a square (440896 = 664²).

The spelling of 1662656 in words is "one million, six hundred sixty-two thousand, six hundred fifty-six".