42040664 has 8 divisors (see below), whose sum is σ = 78826260. Its totient is φ = 21020328.

The previous prime is 42040637. The next prime is 42040667. The reversal of 42040664 is 46604024.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42040667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2627534 + ... + 2627549.

Almost surely, 2^42040664 is an apocalyptic number.

It is an amenable number.

42040664 is a deficient number, since it is larger than the sum of its proper divisors (36785596).

42040664 is a wasteful number, since it uses less digits than its factorization.

42040664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5255089 (or 5255085 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 26.

The square root of 42040664 is about 6483.8772351117. The cubic root of 42040664 is about 347.7148101667.

Adding to 42040664 its reverse (46604024), we get a palindrome (88644688).

The spelling of 42040664 in words is "forty-two million, forty thousand, six hundred sixty-four".