64651968 has 84 divisors (see below), whose sum is σ = 187223400. Its totient is φ = 21328896.

The previous prime is 64651963. The next prime is 64651973. The reversal of 64651968 is 86915646.

It is an interprime number because it is at equal distance from previous prime (64651963) and next prime (64651973).

It is not an unprimeable number, because it can be changed into a prime (64651963) 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 11 ways as a sum of consecutive naturals, for example, 61108 + ... + 62156.

It is an arithmetic number, because the mean of its divisors is an integer number (2228850).

Almost surely, 2^64651968 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64651968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93611700).

64651968 is an abundant number, since it is smaller than the sum of its proper divisors (122571432).

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

64651968 is a wasteful number, since it uses less digits than its factorization.

64651968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1174 (or 1161 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The square root of 64651968 is about 8040.6447502672. The cubic root of 64651968 is about 401.3536803725.

The spelling of 64651968 in words is "sixty-four million, six hundred fifty-one thousand, nine hundred sixty-eight".