42664456 has 8 divisors (see below), whose sum is σ = 79995870. Its totient is φ = 21332224.

The previous prime is 42664451. The next prime is 42664469. The reversal of 42664456 is 65446624.

It can be written as a sum of positive squares in only one way, i.e., 28451556 + 14212900 = 5334^2 + 3770^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (42664451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2666521 + ... + 2666536.

Almost surely, 2^42664456 is an apocalyptic number.

It is an amenable number.

42664456 is a deficient number, since it is larger than the sum of its proper divisors (37331414).

42664456 is a wasteful number, since it uses less digits than its factorization.

42664456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5333063 (or 5333059 counting only the distinct ones).

The product of its digits is 138240, while the sum is 37.

The square root of 42664456 is about 6531.8034263134. The cubic root of 42664456 is about 349.4261508052.

The spelling of 42664456 in words is "forty-two million, six hundred sixty-four thousand, four hundred fifty-six".