65724224 has 14 divisors (see below), whose sum is σ = 130421634. Its totient is φ = 32862080.

The previous prime is 65724221. The next prime is 65724233. The reversal of 65724224 is 42242756.

It can be written as a sum of positive squares in only one way, i.e., 60341824 + 5382400 = 7768^2 + 2320^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a zygodrome in base 5.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65724221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 513407 + ... + 513534.

It is an arithmetic number, because the mean of its divisors is an integer number (9315831).

Almost surely, 2^65724224 is an apocalyptic number.

65724224 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

65724224 is a deficient number, since it is larger than the sum of its proper divisors (64697410).

65724224 is a wasteful number, since it uses less digits than its factorization.

65724224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1026953 (or 1026943 counting only the distinct ones).

The product of its digits is 26880, while the sum is 32.

The square root of 65724224 is about 8107.0477980582. The cubic root of 65724224 is about 403.5603490956.

The spelling of 65724224 in words is "sixty-five million, seven hundred twenty-four thousand, two hundred twenty-four".