64540323 has 24 divisors (see below), whose sum is σ = 97913088. Its totient is φ = 40887792.

The previous prime is 64540319. The next prime is 64540327. The reversal of 64540323 is 32304546.

It is an interprime number because it is at equal distance from previous prime (64540319) and next prime (64540327).

It is not a de Polignac number, because 64540323 - 2² = 64540319 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64540327) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33636 + ... + 35502.

It is an arithmetic number, because the mean of its divisors is an integer number (4079712).

Almost surely, 2^64540323 is an apocalyptic number.

64540323 is a deficient number, since it is larger than the sum of its proper divisors (33372765).

64540323 is a wasteful number, since it uses less digits than its factorization.

64540323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2063 (or 2060 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 27.

The square root of 64540323 is about 8033.6992102020. The cubic root of 64540323 is about 401.1225198429.

Adding to 64540323 its reverse (32304546), we get a palindrome (96844869).

The spelling of 64540323 in words is "sixty-four million, five hundred forty thousand, three hundred twenty-three".