540664447 has 4 divisors (see below), whose sum is σ = 572468256. Its totient is φ = 508860640.

The previous prime is 540664441. The next prime is 540664451. The reversal of 540664447 is 744466045.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-540664447 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (540664441) 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, 15901879 + ... + 15901912.

It is an arithmetic number, because the mean of its divisors is an integer number (143117064).

Almost surely, 2^540664447 is an apocalyptic number.

540664447 is a deficient number, since it is larger than the sum of its proper divisors (31803809).

540664447 is a wasteful number, since it uses less digits than its factorization.

540664447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31803808.

The product of its (nonzero) digits is 322560, while the sum is 40.

The square root of 540664447 is about 23252.1923052430. The cubic root of 540664447 is about 814.6591456084.

The spelling of 540664447 in words is "five hundred forty million, six hundred sixty-four thousand, four hundred forty-seven".