64667144 has 8 divisors (see below), whose sum is σ = 121250910. Its totient is φ = 32333568.

The previous prime is 64667131. The next prime is 64667149. The reversal of 64667144 is 44176646.

It can be written as a sum of positive squares in only one way, i.e., 61811044 + 2856100 = 7862^2 + 1690^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 64667098 and 64667107.

It is not an unprimeable number, because it can be changed into a prime (64667149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4041689 + ... + 4041704.

Almost surely, 2^64667144 is an apocalyptic number.

It is an amenable number.

64667144 is a deficient number, since it is larger than the sum of its proper divisors (56583766).

64667144 is a wasteful number, since it uses less digits than its factorization.

64667144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8083399 (or 8083395 counting only the distinct ones).

The product of its digits is 96768, while the sum is 38.

The square root of 64667144 is about 8041.5884003100. The cubic root of 64667144 is about 401.3850816694.

The spelling of 64667144 in words is "sixty-four million, six hundred sixty-seven thousand, one hundred forty-four".