64644541 has 8 divisors (see below), whose sum is σ = 69682424. Its totient is φ = 59616000.

The previous prime is 64644539. The next prime is 64644563. The reversal of 64644541 is 14544646.

It can be written as a sum of positive squares in 4 ways, for example, as 980100 + 63664441 = 990^2 + 7979^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64644541 - 2¹ = 64644539 is a prime.

It is a super-2 number, since 2×64644541² = 8357833362201362, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64644497 and 64644506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64644511) 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 7 ways as a sum of consecutive naturals, for example, 20041 + ... + 23041.

It is an arithmetic number, because the mean of its divisors is an integer number (8710303).

Almost surely, 2^64644541 is an apocalyptic number.

It is an amenable number.

64644541 is a deficient number, since it is larger than the sum of its proper divisors (5037883).

64644541 is a wasteful number, since it uses less digits than its factorization.

64644541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4671.

The product of its digits is 46080, while the sum is 34.

The square root of 64644541 is about 8040.1828959297. The cubic root of 64644541 is about 401.3383110649.

The spelling of 64644541 in words is "sixty-four million, six hundred forty-four thousand, five hundred forty-one".