31630720442 has 16 divisors (see below), whose sum is σ = 49087589760. Its totient is φ = 15268311408.

The previous prime is 31630720439. The next prime is 31630720477. The reversal of 31630720442 is 24402703613.

It is a super-3 number, since 3×31630720442³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31630720399 and 31630720408.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 616043 + ... + 665409.

It is an arithmetic number, because the mean of its divisors is an integer number (3067974360).

Almost surely, 2^31630720442 is an apocalyptic number.

31630720442 is a deficient number, since it is larger than the sum of its proper divisors (17456869318).

31630720442 is a wasteful number, since it uses less digits than its factorization.

31630720442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60445.

The product of its (nonzero) digits is 24192, while the sum is 32.

The spelling of 31630720442 in words is "thirty-one billion, six hundred thirty million, seven hundred twenty thousand, four hundred forty-two".