65605500 has 144 divisors (see below), whose sum is σ = 211236480. Its totient is φ = 17136000.

The previous prime is 65605489. The next prime is 65605513. The reversal of 65605500 is 550656.

65605500 is a `hidden beast` number, since 6 + 5 + 605 + 50 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 274381 + ... + 274619.

It is an arithmetic number, because the mean of its divisors is an integer number (1466920).

Almost surely, 2^65605500 is an apocalyptic number.

65605500 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65605500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105618240).

65605500 is an abundant number, since it is smaller than the sum of its proper divisors (145630980).

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

65605500 is a wasteful number, since it uses less digits than its factorization.

65605500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325 (or 310 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 27.

The square root of 65605500 is about 8099.7222174591. The cubic root of 65605500 is about 403.3172059819.

Adding to 65605500 its product of nonzero digits (4500), we get a 4-th power (65610000 = 90⁴).

The spelling of 65605500 in words is "sixty-five million, six hundred five thousand, five hundred".