64522639 has 4 divisors (see below), whose sum is σ = 64556856. Its totient is φ = 64488424.

The previous prime is 64522631. The next prime is 64522649. The reversal of 64522639 is 93622546.

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 64522639 - 2³ = 64522631 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64522598 and 64522607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64522631) 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, 14104 + ... + 18109.

It is an arithmetic number, because the mean of its divisors is an integer number (16139214).

Almost surely, 2^64522639 is an apocalyptic number.

64522639 is a deficient number, since it is larger than the sum of its proper divisors (34217).

64522639 is a wasteful number, since it uses less digits than its factorization.

64522639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34216.

The product of its digits is 77760, while the sum is 37.

The square root of 64522639 is about 8032.5985210267. The cubic root of 64522639 is about 401.0858807400.

The spelling of 64522639 in words is "sixty-four million, five hundred twenty-two thousand, six hundred thirty-nine".