64651944 has 96 divisors (see below), whose sum is σ = 189645120. Its totient is φ = 17991168.

The previous prime is 64651943. The next prime is 64651949. The reversal of 64651944 is 44915646.

It is not an unprimeable number, because it can be changed into a prime (64651943) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 471844 + ... + 471980.

It is an arithmetic number, because the mean of its divisors is an integer number (1975470).

Almost surely, 2^64651944 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 64651944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94822560).

64651944 is an abundant number, since it is smaller than the sum of its proper divisors (124993176).

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

64651944 is a wasteful number, since it uses less digits than its factorization.

64651944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259 (or 202 counting only the distinct ones).

The product of its digits is 103680, while the sum is 39.

The square root of 64651944 is about 8040.6432578495. The cubic root of 64651944 is about 401.3536307092.

The spelling of 64651944 in words is "sixty-four million, six hundred fifty-one thousand, nine hundred forty-four".