64555560 has 48 divisors (see below), whose sum is σ = 209806740. Its totient is φ = 17214720.

The previous prime is 64555541. The next prime is 64555583. The reversal of 64555560 is 6555546.

It is a happy number.

64555560 is a `hidden beast` number, since 6 + 45 + 55 + 560 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 64545156 + 10404 = 8034^2 + 102^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 89301 + ... + 90020.

Almost surely, 2^64555560 is an apocalyptic number.

64555560 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64555560 is an abundant number, since it is smaller than the sum of its proper divisors (145251180).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64555560 is a wasteful number, since it uses less digits than its factorization.

64555560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179338 (or 179331 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 36.

The square root of 64555560 is about 8034.6474720426. The cubic root of 64555560 is about 401.1540836914.

The spelling of 64555560 in words is "sixty-four million, five hundred fifty-five thousand, five hundred sixty".