1066507720 has 16 divisors (see below), whose sum is σ = 2399642460. Its totient is φ = 426603072.

The previous prime is 1066507667. The next prime is 1066507727. The reversal of 1066507720 is 277056601.

It can be written as a sum of positive squares in 2 ways, for example, as 1060544356 + 5963364 = 32566^2 + 2442^2 .

It is a super-2 number, since 2×1066507720² = 2274877433639196800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1066507727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13331307 + ... + 13331386.

Almost surely, 2^1066507720 is an apocalyptic number.

1066507720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1066507720 is an abundant number, since it is smaller than the sum of its proper divisors (1333134740).

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

1066507720 is a wasteful number, since it uses less digits than its factorization.

1066507720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26662704 (or 26662700 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 34.

The square root of 1066507720 is about 32657.4297825166. The cubic root of 1066507720 is about 1021.6951563662.

The spelling of 1066507720 in words is "one billion, sixty-six million, five hundred seven thousand, seven hundred twenty".