65273540 has 72 divisors (see below), whose sum is σ = 152252352. Its totient is φ = 23457280.

The previous prime is 65273539. The next prime is 65273617. The reversal of 65273540 is 4537256.

It is a junction number, because it is equal to n+sod(n) for n = 65273497 and 65273506.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 132695 + ... + 133185.

It is an arithmetic number, because the mean of its divisors is an integer number (2114616).

Almost surely, 2^65273540 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 65273540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76126176).

65273540 is an abundant number, since it is smaller than the sum of its proper divisors (86978812).

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

65273540 is a wasteful number, since it uses less digits than its factorization.

65273540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557 (or 538 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 32.

The square root of 65273540 is about 8079.2041687285. The cubic root of 65273540 is about 402.6358015585.

The spelling of 65273540 in words is "sixty-five million, two hundred seventy-three thousand, five hundred forty".