42321688 has 8 divisors (see below), whose sum is σ = 79353180. Its totient is φ = 21160840.

The previous prime is 42321659. The next prime is 42321731. The reversal of 42321688 is 88612324.

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

It is a super-2 number, since 2×42321688² = 3582250550338688, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2645098 + ... + 2645113.

Almost surely, 2^42321688 is an apocalyptic number.

It is an amenable number.

42321688 is a deficient number, since it is larger than the sum of its proper divisors (37031492).

42321688 is a wasteful number, since it uses less digits than its factorization.

42321688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5290217 (or 5290213 counting only the distinct ones).

The product of its digits is 18432, while the sum is 34.

The square root of 42321688 is about 6505.5121243450. The cubic root of 42321688 is about 348.4878655221.

The spelling of 42321688 in words is "forty-two million, three hundred twenty-one thousand, six hundred eighty-eight".