64651540 has 24 divisors (see below), whose sum is σ = 137041632. Its totient is φ = 25618080.

The previous prime is 64651529. The next prime is 64651553. The reversal of 64651540 is 4515646.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 12966 + ... + 17245.

It is an arithmetic number, because the mean of its divisors is an integer number (5710068).

Almost surely, 2^64651540 is an apocalyptic number.

It is an amenable number.

64651540 is an abundant number, since it is smaller than the sum of its proper divisors (72390092).

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

64651540 is a wasteful number, since it uses less digits than its factorization.

64651540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30327 (or 30325 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 64651540 is about 8040.6181354421. The cubic root of 64651540 is about 401.3527947085.

The spelling of 64651540 in words is "sixty-four million, six hundred fifty-one thousand, five hundred forty".