31642228 has 12 divisors (see below), whose sum is σ = 55467972. Its totient is φ = 15794240.

The previous prime is 31642217. The next prime is 31642229. The reversal of 31642228 is 82224613.

It can be written as a sum of positive squares in 2 ways, for example, as 1304164 + 30338064 = 1142^2 + 5508^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31642196 and 31642205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31642229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3943 + ... + 8878.

It is an arithmetic number, because the mean of its divisors is an integer number (4622331).

Almost surely, 2^31642228 is an apocalyptic number.

It is an amenable number.

31642228 is a deficient number, since it is larger than the sum of its proper divisors (23825744).

31642228 is a wasteful number, since it uses less digits than its factorization.

31642228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13442 (or 13440 counting only the distinct ones).

The product of its digits is 4608, while the sum is 28.

The square root of 31642228 is about 5625.1424870842. The cubic root of 31642228 is about 316.2925907217.

The spelling of 31642228 in words is "thirty-one million, six hundred forty-two thousand, two hundred twenty-eight".