64642518 has 24 divisors (see below), whose sum is σ = 142034256. Its totient is φ = 21243600.

The previous prime is 64642511. The next prime is 64642519. The reversal of 64642518 is 81524646.

64642518 is a `hidden beast` number, since 6 + 4 + 642 + 5 + 1 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64642511) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 24013 + ... + 26568.

It is an arithmetic number, because the mean of its divisors is an integer number (5918094).

Almost surely, 2^64642518 is an apocalyptic number.

64642518 is an abundant number, since it is smaller than the sum of its proper divisors (77391738).

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

64642518 is a wasteful number, since it uses less digits than its factorization.

64642518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50660 (or 50657 counting only the distinct ones).

The product of its digits is 46080, while the sum is 36.

The square root of 64642518 is about 8040.0570893496. The cubic root of 64642518 is about 401.3341244992.

The spelling of 64642518 in words is "sixty-four million, six hundred forty-two thousand, five hundred eighteen".