1264033664 has 32 divisors (see below), whose sum is σ = 2586261000. Its totient is φ = 614932992.

The previous prime is 1264033663. The next prime is 1264033697. The reversal of 1264033664 is 4663304621.

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×1264033664² = 3195562207450529792, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1264033663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128714 + ... + 138185.

Almost surely, 2^1264033664 is an apocalyptic number.

It is an amenable number.

1264033664 is an abundant number, since it is smaller than the sum of its proper divisors (1322227336).

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

1264033664 is an equidigital number, since it uses as much as digits as its factorization.

1264033664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266950 (or 266938 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 35.

The square root of 1264033664 is about 35553.2511030989. The cubic root of 1264033664 is about 1081.2336337795.

The spelling of 1264033664 in words is "one billion, two hundred sixty-four million, thirty-three thousand, six hundred sixty-four".