64220515 has 4 divisors (see below), whose sum is σ = 77064624. Its totient is φ = 51376408.

The previous prime is 64220489. The next prime is 64220521. The reversal of 64220515 is 51502246.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51502246 = 2 ⋅25751123.

It is a cyclic number.

It is not a de Polignac number, because 64220515 - 2⁵ = 64220483 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64220515.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 6422047 + ... + 6422056.

It is an arithmetic number, because the mean of its divisors is an integer number (19266156).

Almost surely, 2^64220515 is an apocalyptic number.

64220515 is a deficient number, since it is larger than the sum of its proper divisors (12844109).

64220515 is a wasteful number, since it uses less digits than its factorization.

64220515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12844108.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 64220515 is about 8013.7703361152. The cubic root of 64220515 is about 400.4588796224.

The spelling of 64220515 in words is "sixty-four million, two hundred twenty thousand, five hundred fifteen".