1000646660 has 48 divisors (see below), whose sum is σ = 2265324096. Its totient is φ = 369090432.

The previous prime is 1000646659. The next prime is 1000646681. The reversal of 1000646660 is 666460001.

It is a super-3 number, since 3×1000646660³ (a number of 28 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 453119 + ... + 455321.

It is an arithmetic number, because the mean of its divisors is an integer number (47194252).

Almost surely, 2^1000646660 is an apocalyptic number.

1000646660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1000646660 is an abundant number, since it is smaller than the sum of its proper divisors (1264677436).

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

1000646660 is a wasteful number, since it uses less digits than its factorization.

1000646660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3972 (or 3970 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 1000646660 is about 31632.9995416179. Note that the first 3 decimals coincide. The cubic root of 1000646660 is about 1000.2155068868.

Adding to 1000646660 its sum of digits (29), we get a square (1000646689 = 31633²).

The spelling of 1000646660 in words is "one billion, six hundred forty-six thousand, six hundred sixty".