64637065 has 8 divisors (see below), whose sum is σ = 77707080. Its totient is φ = 51614592.

The previous prime is 64637059. The next prime is 64637087. The reversal of 64637065 is 56073646.

It can be written as a sum of positive squares in 4 ways, for example, as 2715904 + 61921161 = 1648^2 + 7869^2 .

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 64637065 - 2⁹ = 64636553 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8820 + ... + 14389.

It is an arithmetic number, because the mean of its divisors is an integer number (9713385).

Almost surely, 2^64637065 is an apocalyptic number.

It is an amenable number.

64637065 is a deficient number, since it is larger than the sum of its proper divisors (13070015).

64637065 is a wasteful number, since it uses less digits than its factorization.

64637065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23771.

The product of its (nonzero) digits is 90720, while the sum is 37.

The square root of 64637065 is about 8039.7179676902. The cubic root of 64637065 is about 401.3228391687.

The spelling of 64637065 in words is "sixty-four million, six hundred thirty-seven thousand, sixty-five".