64541623 has 4 divisors (see below), whose sum is σ = 64674640. Its totient is φ = 64408608.

The previous prime is 64541621. The next prime is 64541663. The reversal of 64541623 is 32614546.

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

It is a cyclic number.

It is not a de Polignac number, because 64541623 - 2¹ = 64541621 is a prime.

It is a Duffinian number.

It is a zygodrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64541621) 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 3 ways as a sum of consecutive naturals, for example, 65778 + ... + 66751.

It is an arithmetic number, because the mean of its divisors is an integer number (16168660).

Almost surely, 2^64541623 is an apocalyptic number.

64541623 is a deficient number, since it is larger than the sum of its proper divisors (133017).

64541623 is a wasteful number, since it uses less digits than its factorization.

64541623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133016.

The product of its digits is 17280, while the sum is 31.

The square root of 64541623 is about 8033.7801189726. The cubic root of 64541623 is about 401.1252130211.

The spelling of 64541623 in words is "sixty-four million, five hundred forty-one thousand, six hundred twenty-three".