64550815 has 16 divisors (see below), whose sum is σ = 89851392. Its totient is φ = 43601184.

The previous prime is 64550813. The next prime is 64550831. The reversal of 64550815 is 51805546.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 64550815 - 2¹ = 64550813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64550813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11419 + ... + 16108.

It is an arithmetic number, because the mean of its divisors is an integer number (5615712).

Almost surely, 2^64550815 is an apocalyptic number.

64550815 is a deficient number, since it is larger than the sum of its proper divisors (25300577).

64550815 is a wasteful number, since it uses less digits than its factorization.

64550815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27606.

The product of its (nonzero) digits is 24000, while the sum is 34.

The square root of 64550815 is about 8034.3521829703. The cubic root of 64550815 is about 401.1442548310.

The spelling of 64550815 in words is "sixty-four million, five hundred fifty thousand, eight hundred fifteen".