64664442 has 24 divisors (see below), whose sum is σ = 141497460. Its totient is φ = 21340800.

The previous prime is 64664437. The next prime is 64664443. The reversal of 64664442 is 24446646.

It is a happy number.

64664442 is a `hidden beast` number, since 6 + 4 + 6 + 644 + 4 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 43678881 + 20985561 = 6609^2 + 4581^2 .

It is a junction number, because it is equal to n+sod(n) for n = 64664397 and 64664406.

It is not an unprimeable number, because it can be changed into a prime (64664443) 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, 15967 + ... + 19602.

Almost surely, 2^64664442 is an apocalyptic number.

64664442 is an abundant number, since it is smaller than the sum of its proper divisors (76833018).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64664442 is a wasteful number, since it uses less digits than its factorization.

64664442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35678 (or 35675 counting only the distinct ones).

The product of its digits is 110592, while the sum is 36.

The square root of 64664442 is about 8041.4203969199. The cubic root of 64664442 is about 401.3794912076.

The spelling of 64664442 in words is "sixty-four million, six hundred sixty-four thousand, four hundred forty-two".