64538583 has 4 divisors (see below), whose sum is σ = 86051448. Its totient is φ = 43025720.

The previous prime is 64538581. The next prime is 64538603. The reversal of 64538583 is 38583546.

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 64538583 - 2¹ = 64538581 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64538581) 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, 10756428 + ... + 10756433.

It is an arithmetic number, because the mean of its divisors is an integer number (21512862).

Almost surely, 2^64538583 is an apocalyptic number.

64538583 is a deficient number, since it is larger than the sum of its proper divisors (21512865).

64538583 is a wasteful number, since it uses less digits than its factorization.

64538583 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21512864.

The product of its digits is 345600, while the sum is 42.

The square root of 64538583 is about 8033.5909156491. The cubic root of 64538583 is about 401.1189150709.

The spelling of 64538583 in words is "sixty-four million, five hundred thirty-eight thousand, five hundred eighty-three".