1661268 has 24 divisors (see below), whose sum is σ = 4430272. Its totient is φ = 474624.

The previous prime is 1661251. The next prime is 1661273. The reversal of 1661268 is 8621661.

It is a super-2 number, since 2×1661268² = 5519622735648, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9805 + ... + 9972.

2^1661268 is an apocalyptic number.

It is an amenable number.

1661268 is an abundant number, since it is smaller than the sum of its proper divisors (2769004).

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

1661268 is a wasteful number, since it uses less digits than its factorization.

1661268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19791 (or 19789 counting only the distinct ones).

The product of its digits is 3456, while the sum is 30.

The square root of 1661268 is about 1288.9018581723. The cubic root of 1661268 is about 118.4349551345.

The spelling of 1661268 in words is "one million, six hundred sixty-one thousand, two hundred sixty-eight".