31402288642 has 8 divisors (see below), whose sum is σ = 47309125500. Its totient is φ = 15632580144.

The previous prime is 31402288613. The next prime is 31402288657. The reversal of 31402288642 is 24688220413.

It can be written as a sum of positive squares in 2 ways, for example, as 29477799481 + 1924489161 = 171691^2 + 43869^2 .

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

It is a super-2 number, since 2×31402288642² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31402288595 and 31402288604.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34281517 + ... + 34282432.

Almost surely, 2^31402288642 is an apocalyptic number.

31402288642 is a deficient number, since it is larger than the sum of its proper divisors (15906836858).

31402288642 is a wasteful number, since it uses less digits than its factorization.

31402288642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68564180.

The product of its (nonzero) digits is 147456, while the sum is 40.

The spelling of 31402288642 in words is "thirty-one billion, four hundred two million, two hundred eighty-eight thousand, six hundred forty-two".