31328643 has 8 divisors (see below), whose sum is σ = 41885008. Its totient is φ = 20829024.

The previous prime is 31328629. The next prime is 31328651. The reversal of 31328643 is 34682313.

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

It is not a de Polignac number, because 31328643 - 2¹² = 31324547 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31328643.

It is not an unprimeable number, because it can be changed into a prime (31328243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12880 + ... + 15117.

It is an arithmetic number, because the mean of its divisors is an integer number (5235626).

Almost surely, 2^31328643 is an apocalyptic number.

31328643 is a deficient number, since it is larger than the sum of its proper divisors (10556365).

31328643 is a wasteful number, since it uses less digits than its factorization.

31328643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28373.

The product of its digits is 10368, while the sum is 30.

The square root of 31328643 is about 5597.1995676409. The cubic root of 31328643 is about 315.2442650596.

The spelling of 31328643 in words is "thirty-one million, three hundred twenty-eight thousand, six hundred forty-three".