65722720 has 144 divisors (see below), whose sum is σ = 184606128. Its totient is φ = 22041600.

The previous prime is 65722711. The next prime is 65722739. The reversal of 65722720 is 2722756.

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, 650670 + ... + 650770.

It is an arithmetic number, because the mean of its divisors is an integer number (1281987).

Almost surely, 2^65722720 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 65722720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92303064).

65722720 is an abundant number, since it is smaller than the sum of its proper divisors (118883408).

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

65722720 is a wasteful number, since it uses less digits than its factorization.

65722720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213 (or 198 counting only the distinct ones).

The product of its (nonzero) digits is 11760, while the sum is 31.

The square root of 65722720 is about 8106.9550387306. The cubic root of 65722720 is about 403.5572707816.

The spelling of 65722720 in words is "sixty-five million, seven hundred twenty-two thousand, seven hundred twenty".