64212065 has 8 divisors (see below), whose sum is σ = 77454888. Its totient is φ = 51102720.

The previous prime is 64212053. The next prime is 64212073. The reversal of 64212065 is 56021246.

It can be written as a sum of positive squares in 4 ways, for example, as 9909904 + 54302161 = 3148^2 + 7369^2 .

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

It is not a de Polignac number, because 64212065 - 2¹⁶ = 64146529 is a prime.

It is a Duffinian number.

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, 32306 + ... + 34235.

It is an arithmetic number, because the mean of its divisors is an integer number (9681861).

Almost surely, 2^64212065 is an apocalyptic number.

It is an amenable number.

64212065 is a deficient number, since it is larger than the sum of its proper divisors (13242823).

64212065 is a wasteful number, since it uses less digits than its factorization.

64212065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66739.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 64212065 is about 8013.2431012668. The cubic root of 64212065 is about 400.4413150069.

The spelling of 64212065 in words is "sixty-four million, two hundred twelve thousand, sixty-five".