1264635404472 has 128 divisors (see below), whose sum is σ = 3590747631360. Its totient is φ = 367757521920.

The previous prime is 1264635404471. The next prime is 1264635404551. The reversal of 1264635404472 is 2744045364621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1264635404471) 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 31 ways as a sum of consecutive naturals, for example, 173698 + ... + 1599825.

It is an arithmetic number, because the mean of its divisors is an integer number (28052715870).

Almost surely, 2^{1264635404472} is an apocalyptic number.

1264635404472 is a gapful number since it is divisible by the number (12) 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 1264635404472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1795373815680).

1264635404472 is an abundant number, since it is smaller than the sum of its proper divisors (2326112226888).

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

1264635404472 is a wasteful number, since it uses less digits than its factorization.

1264635404472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1773653 (or 1773649 counting only the distinct ones).

The product of its (nonzero) digits is 3870720, while the sum is 48.

The spelling of 1264635404472 in words is "one trillion, two hundred sixty-four billion, six hundred thirty-five million, four hundred four thousand, four hundred seventy-two".