65207540 has 24 divisors (see below), whose sum is σ = 137179392. Its totient is φ = 26036640.

The previous prime is 65207533. The next prime is 65207551. The reversal of 65207540 is 4570256.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 10037 + ... + 15203.

It is an arithmetic number, because the mean of its divisors is an integer number (5715808).

Almost surely, 2^65207540 is an apocalyptic number.

It is an amenable number.

65207540 is an abundant number, since it is smaller than the sum of its proper divisors (71971852).

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

65207540 is a wasteful number, since it uses less digits than its factorization.

65207540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5807 (or 5805 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 29.

The square root of 65207540 is about 8075.1185749808. The cubic root of 65207540 is about 402.5000501524.

Adding to 65207540 its reverse (4570256), we get a palindrome (69777796).

The spelling of 65207540 in words is "sixty-five million, two hundred seven thousand, five hundred forty".