1264703640 has 64 divisors (see below), whose sum is σ = 3796644960. Its totient is φ = 337029120.

The previous prime is 1264703597. The next prime is 1264703641. The reversal of 1264703640 is 463074621.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1264703641) 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, 256882 + ... + 261758.

Almost surely, 2^1264703640 is an apocalyptic number.

1264703640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1264703640 is an abundant number, since it is smaller than the sum of its proper divisors (2531941320).

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

1264703640 is a wasteful number, since it uses less digits than its factorization.

1264703640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7052 (or 7048 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 33.

The square root of 1264703640 is about 35562.6720030990. The cubic root of 1264703640 is about 1081.4246288610.

The spelling of 1264703640 in words is "one billion, two hundred sixty-four million, seven hundred three thousand, six hundred forty".