264401643 has 32 divisors (see below), whose sum is σ = 390604032. Its totient is φ = 157760000.

The previous prime is 264401617. The next prime is 264401647. The reversal of 264401643 is 346104462.

It is a cyclic number.

It is not a de Polignac number, because 264401643 - 2¹² = 264397547 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 264401643.

It is not an unprimeable number, because it can be changed into a prime (264401647) 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 31 ways as a sum of consecutive naturals, for example, 1053268 + ... + 1053518.

It is an arithmetic number, because the mean of its divisors is an integer number (12206376).

Almost surely, 2^264401643 is an apocalyptic number.

264401643 is a deficient number, since it is larger than the sum of its proper divisors (126202389).

264401643 is a wasteful number, since it uses less digits than its factorization.

264401643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 635.

The product of its (nonzero) digits is 13824, while the sum is 30.

The square root of 264401643 is about 16260.4318208343. The cubic root of 264401643 is about 641.8320253279.

The spelling of 264401643 in words is "two hundred sixty-four million, four hundred one thousand, six hundred forty-three".