64513540 has 48 divisors (see below), whose sum is σ = 166747392. Its totient is φ = 20416896.

The previous prime is 64513517. The next prime is 64513549. The reversal of 64513540 is 4531546.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 64513499 and 64513508.

It is not an unprimeable number, because it can be changed into a prime (64513549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15904 + ... + 19543.

It is an arithmetic number, because the mean of its divisors is an integer number (3473904).

Almost surely, 2^64513540 is an apocalyptic number.

It is an amenable number.

64513540 is an abundant number, since it is smaller than the sum of its proper divisors (102233852).

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

64513540 is a wasteful number, since it uses less digits than its factorization.

64513540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35476 (or 35474 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 64513540 is about 8032.0321214497. The cubic root of 64513540 is about 401.0670261073.

The spelling of 64513540 in words is "sixty-four million, five hundred thirteen thousand, five hundred forty".