65880440 has 96 divisors (see below), whose sum is σ = 162464400. Its totient is φ = 24023040.

The previous prime is 65880439. The next prime is 65880509. The reversal of 65880440 is 4408856.

It is a self number, because there is not a number n which added to its sum of digits gives 65880440.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 473891 + ... + 474029.

Almost surely, 2^65880440 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 65880440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81232200).

65880440 is an abundant number, since it is smaller than the sum of its proper divisors (96583960).

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

65880440 is a wasteful number, since it uses less digits than its factorization.

65880440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225 (or 204 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 35.

The square root of 65880440 is about 8116.6766598159. The cubic root of 65880440 is about 403.8798289775.

The spelling of 65880440 in words is "sixty-five million, eight hundred eighty thousand, four hundred forty".