65723280 has 320 divisors, whose sum is σ = 257126400. Its totient is φ = 13547520.

The previous prime is 65723279. The next prime is 65723297. The reversal of 65723280 is 8232756.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 925645 + ... + 925715.

It is an arithmetic number, because the mean of its divisors is an integer number (803520).

Almost surely, 2^65723280 is an apocalyptic number.

65723280 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 65723280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (128563200).

65723280 is an abundant number, since it is smaller than the sum of its proper divisors (191403120).

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

65723280 is a wasteful number, since it uses less digits than its factorization.

65723280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142 (or 136 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 65723280 is about 8106.9895769021. The cubic root of 65723280 is about 403.5584169678.

The spelling of 65723280 in words is "sixty-five million, seven hundred twenty-three thousand, two hundred eighty".