1264320099 has 72 divisors (see below), whose sum is σ = 2211464112. Its totient is φ = 693463680.

The previous prime is 1264320077. The next prime is 1264320149. The reversal of 1264320099 is 9900234621.

1264320099 is a `hidden beast` number, since 1 + 2 + 643 + 2 + 0 + 0 + 9 + 9 = 666.

It is not a de Polignac number, because 1264320099 - 2⁵ = 1264320067 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1264321099) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1156197 + ... + 1157289.

Almost surely, 2^1264320099 is an apocalyptic number.

1264320099 is a deficient number, since it is larger than the sum of its proper divisors (947144013).

1264320099 is a wasteful number, since it uses less digits than its factorization.

1264320099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1217 (or 1207 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 1264320099 is about 35557.2791281898. The cubic root of 1264320099 is about 1081.3152982093.

The spelling of 1264320099 in words is "one billion, two hundred sixty-four million, three hundred twenty thousand, ninety-nine".