264640243 has 8 divisors (see below), whose sum is σ = 310620512. Its totient is φ = 220703616.

The previous prime is 264640219. The next prime is 264640247. The reversal of 264640243 is 342046462.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-264640243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (264640247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 510630 + ... + 511147.

It is an arithmetic number, because the mean of its divisors is an integer number (38827564).

Almost surely, 2^264640243 is an apocalyptic number.

264640243 is a deficient number, since it is larger than the sum of its proper divisors (45980269).

264640243 is a wasteful number, since it uses less digits than its factorization.

264640243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1021821.

The product of its (nonzero) digits is 27648, while the sum is 31.

The square root of 264640243 is about 16267.7669948890. The cubic root of 264640243 is about 642.0250335570.

The spelling of 264640243 in words is "two hundred sixty-four million, six hundred forty thousand, two hundred forty-three".