42997664 has 12 divisors (see below), whose sum is σ = 84651714. Its totient is φ = 21498816.

The previous prime is 42997637. The next prime is 42997667. The reversal of 42997664 is 46679924.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 30691600 + 12306064 = 5540^2 + 3508^2 .

It is not an unprimeable number, because it can be changed into a prime (42997667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 671807 + ... + 671870.

Almost surely, 2^42997664 is an apocalyptic number.

It is an amenable number.

42997664 is a deficient number, since it is larger than the sum of its proper divisors (41654050).

42997664 is a wasteful number, since it uses less digits than its factorization.

42997664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1343687 (or 1343679 counting only the distinct ones).

The product of its digits is 653184, while the sum is 47.

The square root of 42997664 is about 6557.2604035527. The cubic root of 42997664 is about 350.3334617859. Note that the first 3 decimals are identical.

The spelling of 42997664 in words is "forty-two million, nine hundred ninety-seven thousand, six hundred sixty-four".