65216880 has 160 divisors (see below), whose sum is σ = 227515200. Its totient is φ = 17169408.

The previous prime is 65216867. The next prime is 65216897. The reversal of 65216880 is 8861256.

It is a happy number.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 235302 + ... + 235578.

It is an arithmetic number, because the mean of its divisors is an integer number (1421970).

Almost surely, 2^65216880 is an apocalyptic number.

65216880 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65216880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113757600).

65216880 is an abundant number, since it is smaller than the sum of its proper divisors (162298320).

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

65216880 is a wasteful number, since it uses less digits than its factorization.

65216880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408 (or 396 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 65216880 is about 8075.6968739546. The cubic root of 65216880 is about 402.5192665957.

The spelling of 65216880 in words is "sixty-five million, two hundred sixteen thousand, eight hundred eighty".