64420144 has 10 divisors (see below), whose sum is σ = 124814060. Its totient is φ = 32210064.

The previous prime is 64420141. The next prime is 64420151. The reversal of 64420144 is 44102446.

It is not an unprimeable number, because it can be changed into a prime (64420141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2013114 + ... + 2013145.

It is an arithmetic number, because the mean of its divisors is an integer number (12481406).

Almost surely, 2^64420144 is an apocalyptic number.

It is an amenable number.

64420144 is a deficient number, since it is larger than the sum of its proper divisors (60393916).

64420144 is a wasteful number, since it uses less digits than its factorization.

64420144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4026267 (or 4026261 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 25.

The square root of 64420144 is about 8026.2160449367. The cubic root of 64420144 is about 400.8733915799.

The spelling of 64420144 in words is "sixty-four million, four hundred twenty thousand, one hundred forty-four".