31628378751 has 4 divisors (see below), whose sum is σ = 42171171672. Its totient is φ = 21085585832.

The previous prime is 31628378701. The next prime is 31628378753. The reversal of 31628378751 is 15787382613.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31628378751 - 2³⁴ = 14448509567 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31628378694 and 31628378703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31628378753) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5271396456 + ... + 5271396461.

It is an arithmetic number, because the mean of its divisors is an integer number (10542792918).

Almost surely, 2^31628378751 is an apocalyptic number.

31628378751 is a deficient number, since it is larger than the sum of its proper divisors (10542792921).

31628378751 is a wasteful number, since it uses less digits than its factorization.

31628378751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10542792920.

The product of its digits is 1693440, while the sum is 51.

The spelling of 31628378751 in words is "thirty-one billion, six hundred twenty-eight million, three hundred seventy-eight thousand, seven hundred fifty-one".