1066394280 has 128 divisors (see below), whose sum is σ = 3734138880. Its totient is φ = 238552320.

The previous prime is 1066394267. The next prime is 1066394299. The reversal of 1066394280 is 824936601.

It is a super-2 number, since 2×1066394280² = 2274393520833436800, which contains 22 as substring.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25975 + ... + 52985.

It is an arithmetic number, because the mean of its divisors is an integer number (29172960).

Almost surely, 2^1066394280 is an apocalyptic number.

1066394280 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 1066394280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1867069440).

1066394280 is an abundant number, since it is smaller than the sum of its proper divisors (2667744600).

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

1066394280 is a wasteful number, since it uses less digits than its factorization.

1066394280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27079 (or 27075 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 39.

The square root of 1066394280 is about 32655.6929186934. The cubic root of 1066394280 is about 1021.6589305906.

The spelling of 1066394280 in words is "one billion, sixty-six million, three hundred ninety-four thousand, two hundred eighty".