31443028 has 6 divisors (see below), whose sum is σ = 55025306. Its totient is φ = 15721512.

The previous prime is 31442963. The next prime is 31443031. The reversal of 31443028 is 82034413.

It can be written as a sum of positive squares in only one way, i.e., 15856324 + 15586704 = 3982^2 + 3948^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31442993 and 31443011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3930375 + ... + 3930382.

Almost surely, 2^31443028 is an apocalyptic number.

It is an amenable number.

31443028 is a deficient number, since it is larger than the sum of its proper divisors (23582278).

31443028 is a wasteful number, since it uses less digits than its factorization.

31443028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7860761 (or 7860759 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 31443028 is about 5607.4083140075. The cubic root of 31443028 is about 315.6274651704.

The spelling of 31443028 in words is "thirty-one million, four hundred forty-three thousand, twenty-eight".