1264646660 has 36 divisors (see below), whose sum is σ = 2821181412. Its totient is φ = 476100096.

The previous prime is 1264646633. The next prime is 1264646689. The reversal of 1264646660 is 666464621.

It can be written as a sum of positive squares in 6 ways, for example, as 118417924 + 1146228736 = 10882^2 + 33856^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 103619 + ... + 115178.

Almost surely, 2^1264646660 is an apocalyptic number.

1264646660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1264646660 is an abundant number, since it is smaller than the sum of its proper divisors (1556534752).

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

1264646660 is a wasteful number, since it uses less digits than its factorization.

1264646660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218840 (or 218821 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 41.

The square root of 1264646660 is about 35561.8708731698. The cubic root of 1264646660 is about 1081.4083877699.

The spelling of 1264646660 in words is "one billion, two hundred sixty-four million, six hundred forty-six thousand, six hundred sixty".