42731636 has 6 divisors (see below), whose sum is σ = 74780370. Its totient is φ = 21365816.

The previous prime is 42731603. The next prime is 42731657. The reversal of 42731636 is 63613724.

It can be written as a sum of positive squares in only one way, i.e., 42250000 + 481636 = 6500^2 + 694^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5341451 + ... + 5341458.

It is an arithmetic number, because the mean of its divisors is an integer number (12463395).

Almost surely, 2^42731636 is an apocalyptic number.

It is an amenable number.

42731636 is a deficient number, since it is larger than the sum of its proper divisors (32048734).

42731636 is a wasteful number, since it uses less digits than its factorization.

42731636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10682913 (or 10682911 counting only the distinct ones).

The product of its digits is 18144, while the sum is 32.

The square root of 42731636 is about 6536.9439342861. The cubic root of 42731636 is about 349.6094582601.

The spelling of 42731636 in words is "forty-two million, seven hundred thirty-one thousand, six hundred thirty-six".