65867728 has 20 divisors (see below), whose sum is σ = 128183140. Its totient is φ = 32788224.

The previous prime is 65867723. The next prime is 65867731. The reversal of 65867728 is 82776856.

It can be written as a sum of positive squares in 2 ways, for example, as 49449024 + 16418704 = 7032^2 + 4052^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65867723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5325 + ... + 12652.

It is an arithmetic number, because the mean of its divisors is an integer number (6409157).

Almost surely, 2^65867728 is an apocalyptic number.

It is an amenable number.

65867728 is a deficient number, since it is larger than the sum of its proper divisors (62315412).

65867728 is a wasteful number, since it uses less digits than its factorization.

65867728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18214 (or 18208 counting only the distinct ones).

The product of its digits is 1128960, while the sum is 49.

The square root of 65867728 is about 8115.8935429194. The cubic root of 65867728 is about 403.8538503479.

It can be divided in two parts, 658 and 67728, that added together give a palindrome (68386).

The spelling of 65867728 in words is "sixty-five million, eight hundred sixty-seven thousand, seven hundred twenty-eight".