1264896440 has 32 divisors (see below), whose sum is σ = 2847096000. Its totient is φ = 505766784.

The previous prime is 1264896439. The next prime is 1264896449. The reversal of 1264896440 is 446984621.

It is a junction number, because it is equal to n+sod(n) for n = 1264896391 and 1264896400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1264896449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152726 + ... + 160794.

It is an arithmetic number, because the mean of its divisors is an integer number (88971750).

Almost surely, 2^1264896440 is an apocalyptic number.

1264896440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1264896440 is an abundant number, since it is smaller than the sum of its proper divisors (1582199560).

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

1264896440 is a wasteful number, since it uses less digits than its factorization.

1264896440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11999 (or 11995 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 44.

The square root of 1264896440 is about 35565.3826072489. The cubic root of 1264896440 is about 1081.4795793036.

The spelling of 1264896440 in words is "one billion, two hundred sixty-four million, eight hundred ninety-six thousand, four hundred forty".