1264420660 has 12 divisors (see below), whose sum is σ = 2655283428. Its totient is φ = 505768256.

The previous prime is 1264420639. The next prime is 1264420667. The reversal of 1264420660 is 660244621.

It can be written as a sum of positive squares in 2 ways, for example, as 851355684 + 413064976 = 29178^2 + 20324^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1264420667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31610497 + ... + 31610536.

It is an arithmetic number, because the mean of its divisors is an integer number (221273619).

Almost surely, 2^1264420660 is an apocalyptic number.

1264420660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1264420660 is an abundant number, since it is smaller than the sum of its proper divisors (1390862768).

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

1264420660 is a wasteful number, since it uses less digits than its factorization.

1264420660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63221042 (or 63221040 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 1264420660 is about 35558.6931705877. The cubic root of 1264420660 is about 1081.3439658611.

The spelling of 1264420660 in words is "one billion, two hundred sixty-four million, four hundred twenty thousand, six hundred sixty".