65881530 has 96 divisors (see below), whose sum is σ = 201277440. Its totient is φ = 14739840.

The previous prime is 65881489. The next prime is 65881561. The reversal of 65881530 is 3518856.

65881530 = 11² + 12² + ... + 582².

It is a Curzon 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, 10311 + ... + 15429.

It is an arithmetic number, because the mean of its divisors is an integer number (2096640).

Almost surely, 2^65881530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65881530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100638720).

65881530 is an abundant number, since it is smaller than the sum of its proper divisors (135395910).

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

65881530 is a wasteful number, since it uses less digits than its factorization.

65881530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5156 (or 5153 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The square root of 65881530 is about 8116.7438052460. The cubic root of 65881530 is about 403.8820563790.

It can be divided in two parts, 6588 and 1530, that added together give a palindrome (8118).

The spelling of 65881530 in words is "sixty-five million, eight hundred eighty-one thousand, five hundred thirty".