65605540 has 192 divisors, whose sum is σ = 193052160. Its totient is φ = 18063360.

The previous prime is 65605513. The next prime is 65605543. The reversal of 65605540 is 4550656.

It is not an unprimeable number, because it can be changed into a prime (65605543) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 580524 + ... + 580636.

It is an arithmetic number, because the mean of its divisors is an integer number (1005480).

Almost surely, 2^65605540 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 65605540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96526080).

65605540 is an abundant number, since it is smaller than the sum of its proper divisors (127446620).

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

65605540 is a wasteful number, since it uses less digits than its factorization.

65605540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182 (or 180 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 31.

The square root of 65605540 is about 8099.7246866792. The cubic root of 65605540 is about 403.3172879501.

It can be divided in two parts, 6560 and 5540, that added together give a square (12100 = 110²).

The spelling of 65605540 in words is "sixty-five million, six hundred five thousand, five hundred forty".