64144705 has 16 divisors (see below), whose sum is σ = 79393104. Its totient is φ = 49720320.

The previous prime is 64144699. The next prime is 64144709. The reversal of 64144705 is 50744146.

It can be written as a sum of positive squares in 8 ways, for example, as 7096896 + 57047809 = 2664^2 + 7553^2 .

It is not a de Polignac number, because 64144705 - 2¹¹ = 64142657 is a prime.

It is a super-2 number, since 2×64144705² = 8229086359074050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64144709) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31189 + ... + 33181.

It is an arithmetic number, because the mean of its divisors is an integer number (4962069).

Almost surely, 2^64144705 is an apocalyptic number.

It is an amenable number.

64144705 is a deficient number, since it is larger than the sum of its proper divisors (15248399).

64144705 is a wasteful number, since it uses less digits than its factorization.

64144705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2196.

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 64144705 is about 8009.0389560796. The cubic root of 64144705 is about 400.3012418265.

The spelling of 64144705 in words is "sixty-four million, one hundred forty-four thousand, seven hundred five".