64205556 has 12 divisors (see below), whose sum is σ = 149812992. Its totient is φ = 21401848.

The previous prime is 64205551. The next prime is 64205573. The reversal of 64205556 is 65550246.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64205551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2675220 + ... + 2675243.

It is an arithmetic number, because the mean of its divisors is an integer number (12484416).

Almost surely, 2^64205556 is an apocalyptic number.

It is an amenable number.

64205556 is an abundant number, since it is smaller than the sum of its proper divisors (85607436).

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

64205556 is a wasteful number, since it uses less digits than its factorization.

64205556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5350470 (or 5350468 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 33.

The square root of 64205556 is about 8012.8369507934. The cubic root of 64205556 is about 400.4277840057.

The spelling of 64205556 in words is "sixty-four million, two hundred five thousand, five hundred fifty-six".