1264012640 has 96 divisors (see below), whose sum is σ = 3299304960. Its totient is φ = 453772800.

The previous prime is 1264012619. The next prime is 1264012643. The reversal of 1264012640 is 462104621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1264012643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 134495 + ... + 143585.

It is an arithmetic number, because the mean of its divisors is an integer number (34367760).

Almost surely, 2^1264012640 is an apocalyptic number.

1264012640 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 1264012640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1649652480).

1264012640 is an abundant number, since it is smaller than the sum of its proper divisors (2035292320).

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

1264012640 is a wasteful number, since it uses less digits than its factorization.

1264012640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9196 (or 9188 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 1264012640 is about 35552.9554327063. The cubic root of 1264012640 is about 1081.2276392181.

The spelling of 1264012640 in words is "one billion, two hundred sixty-four million, twelve thousand, six hundred forty".