64444261 has 12 divisors (see below), whose sum is σ = 75452268. Its totient is φ = 54879552.

The previous prime is 64444231. The next prime is 64444267. The reversal of 64444261 is 16244446.

It can be written as a sum of positive squares in 2 ways, for example, as 13764100 + 50680161 = 3710^2 + 7119^2 .

It is not a de Polignac number, because 64444261 - 2¹⁵ = 64411493 is a prime.

It is a super-2 number, since 2×64444261² = 8306125551672242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64444267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3505 + ... + 11881.

It is an arithmetic number, because the mean of its divisors is an integer number (6287689).

Almost surely, 2^64444261 is an apocalyptic number.

It is an amenable number.

64444261 is a deficient number, since it is larger than the sum of its proper divisors (11008007).

64444261 is a wasteful number, since it uses less digits than its factorization.

64444261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8548 (or 8541 counting only the distinct ones).

The product of its digits is 18432, while the sum is 31.

The square root of 64444261 is about 8027.7182935128. The cubic root of 64444261 is about 400.9234103927.

The spelling of 64444261 in words is "sixty-four million, four hundred forty-four thousand, two hundred sixty-one".