64517540 has 24 divisors (see below), whose sum is σ = 142618560. Its totient is φ = 24448608.

The previous prime is 64517429. The next prime is 64517561. The reversal of 64517540 is 4571546.

It is a junction number, because it is equal to n+sod(n) for n = 64517497 and 64517506.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84512 + ... + 85271.

It is an arithmetic number, because the mean of its divisors is an integer number (5942440).

Almost surely, 2^64517540 is an apocalyptic number.

It is an amenable number.

64517540 is an abundant number, since it is smaller than the sum of its proper divisors (78101020).

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

64517540 is a wasteful number, since it uses less digits than its factorization.

64517540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169811 (or 169809 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 32.

The square root of 64517540 is about 8032.2811205784. The cubic root of 64517540 is about 401.0753149871.

The spelling of 64517540 in words is "sixty-four million, five hundred seventeen thousand, five hundred forty".