65889880 has 64 divisors (see below), whose sum is σ = 174919680. Its totient is φ = 21859200.

The previous prime is 65889847. The next prime is 65889881. The reversal of 65889880 is 8898856.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65889881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4885 + ... + 12475.

It is an arithmetic number, because the mean of its divisors is an integer number (2733120).

Almost surely, 2^65889880 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 65889880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87459840).

65889880 is an abundant number, since it is smaller than the sum of its proper divisors (109029800).

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

65889880 is a wasteful number, since it uses less digits than its factorization.

65889880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7640 (or 7636 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 52.

The square root of 65889880 is about 8117.2581577772. The cubic root of 65889880 is about 403.8991186862.

The spelling of 65889880 in words is "sixty-five million, eight hundred eighty-nine thousand, eight hundred eighty".