1264256405240 has 64 divisors (see below), whose sum is σ = 2893997808000. Its totient is φ = 496932618240.

The previous prime is 1264256405231. The next prime is 1264256405249. The reversal of 1264256405240 is 425046524621.

It is an interprime number because it is at equal distance from previous prime (1264256405231) and next prime (1264256405249).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1264256405249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2285816 + ... + 2784504.

It is an arithmetic number, because the mean of its divisors is an integer number (45218715750).

Almost surely, 2^{1264256405240} is an apocalyptic number.

1264256405240 is a gapful number since it is divisible by the number (10) 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 1264256405240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1446998904000).

1264256405240 is an abundant number, since it is smaller than the sum of its proper divisors (1629741402760).

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

1264256405240 is a wasteful number, since it uses less digits than its factorization.

1264256405240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499800 (or 499796 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 41.

The spelling of 1264256405240 in words is "one trillion, two hundred sixty-four billion, two hundred fifty-six million, four hundred five thousand, two hundred forty".