64215365 has 4 divisors (see below), whose sum is σ = 77058444. Its totient is φ = 51372288.

The previous prime is 64215343. The next prime is 64215401. The reversal of 64215365 is 56351246.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 50324836 + 13890529 = 7094^2 + 3727^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64215365 is a prime.

It is a super-2 number, since 2×64215365² = 8247226204166450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6421532 + ... + 6421541.

It is an arithmetic number, because the mean of its divisors is an integer number (19264611).

Almost surely, 2^64215365 is an apocalyptic number.

It is an amenable number.

64215365 is a deficient number, since it is larger than the sum of its proper divisors (12843079).

64215365 is a wasteful number, since it uses less digits than its factorization.

64215365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12843078.

The product of its digits is 21600, while the sum is 32.

The square root of 64215365 is about 8013.4490077619. The cubic root of 64215365 is about 400.4481747443.

The spelling of 64215365 in words is "sixty-four million, two hundred fifteen thousand, three hundred sixty-five".