65711540 has 12 divisors (see below), whose sum is σ = 137994276. Its totient is φ = 26284608.

The previous prime is 65711539. The next prime is 65711543. The reversal of 65711540 is 4511756.

It can be written as a sum of positive squares in 2 ways, for example, as 36529936 + 29181604 = 6044^2 + 5402^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65711543) 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, 1642769 + ... + 1642808.

It is an arithmetic number, because the mean of its divisors is an integer number (11499523).

Almost surely, 2^65711540 is an apocalyptic number.

It is an amenable number.

65711540 is an abundant number, since it is smaller than the sum of its proper divisors (72282736).

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

65711540 is a wasteful number, since it uses less digits than its factorization.

65711540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3285586 (or 3285584 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 29.

The square root of 65711540 is about 8106.2654780114. The cubic root of 65711540 is about 403.5343866296.

The spelling of 65711540 in words is "sixty-five million, seven hundred eleven thousand, five hundred forty".