42447664 has 20 divisors (see below), whose sum is σ = 93991504. Its totient is φ = 18191808.

The previous prime is 42447641. The next prime is 42447679. The reversal of 42447664 is 46674424.

It is a nialpdrome in base 9.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189387 + ... + 189610.

Almost surely, 2^42447664 is an apocalyptic number.

It is an amenable number.

42447664 is an abundant number, since it is smaller than the sum of its proper divisors (51543840).

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

42447664 is a wasteful number, since it uses less digits than its factorization.

42447664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379012 (or 379006 counting only the distinct ones).

The product of its digits is 129024, while the sum is 37.

The square root of 42447664 is about 6515.1871807340. The cubic root of 42447664 is about 348.8332961369.

The spelling of 42447664 in words is "forty-two million, four hundred forty-seven thousand, six hundred sixty-four".