31628218042 has 8 divisors (see below), whose sum is σ = 47877578100. Its totient is φ = 15669025344.

The previous prime is 31628217977. The next prime is 31628218051. The reversal of 31628218042 is 24081282613.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 29149074361 + 2479143681 = 170731^2 + 49791^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 31628217992 and 31628218010.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72541567 + ... + 72542002.

Almost surely, 2^31628218042 is an apocalyptic number.

31628218042 is a deficient number, since it is larger than the sum of its proper divisors (16249360058).

31628218042 is a wasteful number, since it uses less digits than its factorization.

31628218042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145083680.

The product of its (nonzero) digits is 36864, while the sum is 37.

The spelling of 31628218042 in words is "thirty-one billion, six hundred twenty-eight million, two hundred eighteen thousand, forty-two".