1264640345 has 16 divisors (see below), whose sum is σ = 1533504720. Its totient is φ = 1001113344.

The previous prime is 1264640341. The next prime is 1264640369. The reversal of 1264640345 is 5430464621.

It can be written as a sum of positive squares in 8 ways, for example, as 42159049 + 1222481296 = 6493^2 + 34964^2 .

It is a cyclic number.

It is not a de Polignac number, because 1264640345 - 2² = 1264640341 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1264640341) 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, 791087 + ... + 792683.

It is an arithmetic number, because the mean of its divisors is an integer number (95844045).

Almost surely, 2^1264640345 is an apocalyptic number.

It is an amenable number.

1264640345 is a deficient number, since it is larger than the sum of its proper divisors (268864375).

1264640345 is a wasteful number, since it uses less digits than its factorization.

1264640345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3164.

The product of its (nonzero) digits is 69120, while the sum is 35.

The square root of 1264640345 is about 35561.7820841420. The cubic root of 1264640345 is about 1081.4065877664.

The spelling of 1264640345 in words is "one billion, two hundred sixty-four million, six hundred forty thousand, three hundred forty-five".