31666742 has 8 divisors (see below), whose sum is σ = 47536632. Its totient is φ = 15821200.

The previous prime is 31666721. The next prime is 31666751. The reversal of 31666742 is 24766613.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2384 + ... + 8307.

It is an arithmetic number, because the mean of its divisors is an integer number (5942079).

Almost surely, 2^31666742 is an apocalyptic number.

31666742 is a deficient number, since it is larger than the sum of its proper divisors (15869890).

31666742 is a wasteful number, since it uses less digits than its factorization.

31666742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12174.

The product of its digits is 36288, while the sum is 35.

The square root of 31666742 is about 5627.3210322497. The cubic root of 31666742 is about 316.3742494798.

The spelling of 31666742 in words is "thirty-one million, six hundred sixty-six thousand, seven hundred forty-two".