64605567 has 16 divisors (see below), whose sum is σ = 97650560. Its totient is φ = 37664352.

The previous prime is 64605557. The next prime is 64605577. The reversal of 64605567 is 76550646.

It is an interprime number because it is at equal distance from previous prime (64605557) and next prime (64605577).

It is not a de Polignac number, because 64605567 - 2⁶ = 64605503 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64605557) 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, 42853 + ... + 44334.

It is an arithmetic number, because the mean of its divisors is an integer number (6103160).

Almost surely, 2^64605567 is an apocalyptic number.

64605567 is a deficient number, since it is larger than the sum of its proper divisors (33044993).

64605567 is a wasteful number, since it uses less digits than its factorization.

64605567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87222.

The product of its (nonzero) digits is 151200, while the sum is 39.

The square root of 64605567 is about 8037.7588294250. The cubic root of 64605567 is about 401.2576396290.

The spelling of 64605567 in words is "sixty-four million, six hundred five thousand, five hundred sixty-seven".