65720732 has 96 divisors (see below), whose sum is σ = 151173120. Its totient is φ = 24261120.

The previous prime is 65720731. The next prime is 65720737. The reversal of 65720732 is 23702756.

It is a happy number.

It is a super-2 number, since 2×65720732² = 8638429229231648, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65720731) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 831869 + ... + 831947.

It is an arithmetic number, because the mean of its divisors is an integer number (1574720).

Almost surely, 2^65720732 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 65720732, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75586560).

65720732 is an abundant number, since it is smaller than the sum of its proper divisors (85452388).

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

65720732 is a wasteful number, since it uses less digits than its factorization.

65720732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211 (or 209 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 32.

The square root of 65720732 is about 8106.8324270334. The cubic root of 65720732 is about 403.5532017679.

The spelling of 65720732 in words is "sixty-five million, seven hundred twenty thousand, seven hundred thirty-two".