65726440 has 32 divisors (see below), whose sum is σ = 159261480. Its totient is φ = 24268032.

The previous prime is 65726407. The next prime is 65726447. The reversal of 65726440 is 4462756.

It can be written as a sum of positive squares in 4 ways, for example, as 31877316 + 33849124 = 5646^2 + 5818^2 .

It is a junction number, because it is equal to n+sod(n) for n = 65726396 and 65726405.

It is not an unprimeable number, because it can be changed into a prime (65726447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62679 + ... + 63718.

Almost surely, 2^65726440 is an apocalyptic number.

It is an amenable number.

65726440 is an abundant number, since it is smaller than the sum of its proper divisors (93535040).

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

65726440 is a wasteful number, since it uses less digits than its factorization.

65726440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126421 (or 126417 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 34.

The square root of 65726440 is about 8107.1844681122. The cubic root of 65726440 is about 403.5648846110.

It can be divided in two parts, 65726 and 440, that added together give a palindrome (66166).

The spelling of 65726440 in words is "sixty-five million, seven hundred twenty-six thousand, four hundred forty".