64555616 has 48 divisors (see below), whose sum is σ = 135399600. Its totient is φ = 30210048.

The previous prime is 64555583. The next prime is 64555619. The reversal of 64555616 is 61655546.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a self number, because there is not a number n which added to its sum of digits gives 64555616.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64555619) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 53516 + ... + 54708.

It is an arithmetic number, because the mean of its divisors is an integer number (2820825).

Almost surely, 2^64555616 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64555616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67699800).

64555616 is an abundant number, since it is smaller than the sum of its proper divisors (70843984).

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

64555616 is a wasteful number, since it uses less digits than its factorization.

64555616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1311 (or 1303 counting only the distinct ones).

The product of its digits is 108000, while the sum is 38.

The square root of 64555616 is about 8034.6509569489. The cubic root of 64555616 is about 401.1541996877.

The spelling of 64555616 in words is "sixty-four million, five hundred fifty-five thousand, six hundred sixteen".