31628565427 has 4 divisors (see below), whose sum is σ = 31642482600. Its totient is φ = 31614648256.

The previous prime is 31628565421. The next prime is 31628565443. The reversal of 31628565427 is 72456582613.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72456582613 = 6961 ⋅10408933.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31628565427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31628565421) 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, 6955177 + ... + 6959722.

It is an arithmetic number, because the mean of its divisors is an integer number (7910620650).

Almost surely, 2^31628565427 is an apocalyptic number.

31628565427 is a deficient number, since it is larger than the sum of its proper divisors (13917173).

31628565427 is a wasteful number, since it uses less digits than its factorization.

31628565427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13917172.

The product of its digits is 2419200, while the sum is 49.

The spelling of 31628565427 in words is "thirty-one billion, six hundred twenty-eight million, five hundred sixty-five thousand, four hundred twenty-seven".