65610880 has 64 divisors (see below), whose sum is σ = 161959680. Its totient is φ = 25390080.

The previous prime is 65610877. The next prime is 65610899. The reversal of 65610880 is 8801656.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18187 + ... + 21493.

It is an arithmetic number, because the mean of its divisors is an integer number (2530620).

Almost surely, 2^65610880 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 65610880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80979840).

65610880 is an abundant number, since it is smaller than the sum of its proper divisors (96348800).

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

65610880 is a wasteful number, since it uses less digits than its factorization.

65610880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3357 (or 3345 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 65610880 is about 8100.0543208055. The cubic root of 65610880 is about 403.3282303994.

The spelling of 65610880 in words is "sixty-five million, six hundred ten thousand, eight hundred eighty".