64067481 has 12 divisors (see below), whose sum is σ = 92658852. Its totient is φ = 42657696.

The previous prime is 64067459. The next prime is 64067491. The reversal of 64067481 is 18476046.

64067481 is a `hidden beast` number, since 640 + 6 + 7 + 4 + 8 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 56115081 + 7952400 = 7491^2 + 2820^2 .

It is not a de Polignac number, because 64067481 - 2⁶ = 64067417 is a prime.

It is a super-2 number, since 2×64067481² = 8209284243370722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64067401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3835 + ... + 11951.

It is an arithmetic number, because the mean of its divisors is an integer number (7721571).

Almost surely, 2^64067481 is an apocalyptic number.

It is an amenable number.

64067481 is a deficient number, since it is larger than the sum of its proper divisors (28591371).

64067481 is a wasteful number, since it uses less digits than its factorization.

64067481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9000 (or 8997 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 64067481 is about 8004.2164513461. The cubic root of 64067481 is about 400.1405360349.

It can be divided in two parts, 640 and 67481, that added together give a square (68121 = 261²).

The spelling of 64067481 in words is "sixty-four million, sixty-seven thousand, four hundred eighty-one".