64451144 has 8 divisors (see below), whose sum is σ = 120845910. Its totient is φ = 32225568.

The previous prime is 64451143. The next prime is 64451159. The reversal of 64451144 is 44115446.

It can be written as a sum of positive squares in only one way, i.e., 60248644 + 4202500 = 7762^2 + 2050^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (64451143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4028189 + ... + 4028204.

Almost surely, 2^64451144 is an apocalyptic number.

It is an amenable number.

64451144 is a deficient number, since it is larger than the sum of its proper divisors (56394766).

64451144 is a wasteful number, since it uses less digits than its factorization.

64451144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8056399 (or 8056395 counting only the distinct ones).

The product of its digits is 7680, while the sum is 29.

The square root of 64451144 is about 8028.1469842050. The cubic root of 64451144 is about 400.9376834899.

The spelling of 64451144 in words is "sixty-four million, four hundred fifty-one thousand, one hundred forty-four".