64651340 has 48 divisors (see below), whose sum is σ = 154822752. Its totient is φ = 22465536.

The previous prime is 64651339. The next prime is 64651369. The reversal of 64651340 is 4315646.

It is a happy 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 15 ways as a sum of consecutive naturals, for example, 2894 + ... + 11733.

It is an arithmetic number, because the mean of its divisors is an integer number (3225474).

Almost surely, 2^64651340 is an apocalyptic number.

It is an amenable number.

64651340 is an abundant number, since it is smaller than the sum of its proper divisors (90171412).

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

64651340 is a wasteful number, since it uses less digits than its factorization.

64651340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14666 (or 14664 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 64651340 is about 8040.6056985777. The cubic root of 64651340 is about 401.3523808455.

Adding to 64651340 its reverse (4315646), we get a palindrome (68966986).

The spelling of 64651340 in words is "sixty-four million, six hundred fifty-one thousand, three hundred forty".