64445555 has 24 divisors (see below), whose sum is σ = 83140512. Its totient is φ = 47941632.

The previous prime is 64445551. The next prime is 64445603. The reversal of 64445555 is 55554446.

It is not a de Polignac number, because 64445555 - 2² = 64445551 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64445551) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 148619 + ... + 149051.

It is an arithmetic number, because the mean of its divisors is an integer number (3464188).

Almost surely, 2^64445555 is an apocalyptic number.

64445555 is a deficient number, since it is larger than the sum of its proper divisors (18694957).

64445555 is a wasteful number, since it uses less digits than its factorization.

64445555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 575 (or 558 counting only the distinct ones).

The product of its digits is 240000, while the sum is 38.

The square root of 64445555 is about 8027.7988888611. The cubic root of 64445555 is about 400.9260938043.

The spelling of 64445555 in words is "sixty-four million, four hundred forty-five thousand, five hundred fifty-five".