1066444720 has 80 divisors (see below), whose sum is σ = 2767894272. Its totient is φ = 378766080.

The previous prime is 1066444693. The next prime is 1066444723. The reversal of 1066444720 is 274446601.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×1066444720² = 2274608681631756800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1066444723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23749 + ... + 51931.

Almost surely, 2^1066444720 is an apocalyptic number.

1066444720 is a gapful number since it is divisible by the number (10) 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 1066444720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1383947136).

1066444720 is an abundant number, since it is smaller than the sum of its proper divisors (1701449552).

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

1066444720 is a wasteful number, since it uses less digits than its factorization.

1066444720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28250 (or 28244 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 34.

The square root of 1066444720 is about 32656.4652098172. The cubic root of 1066444720 is about 1021.6750383489.

The spelling of 1066444720 in words is "one billion, sixty-six million, four hundred forty-four thousand, seven hundred twenty".