31305028 has 12 divisors (see below), whose sum is σ = 55534780. Its totient is φ = 15437952.

The previous prime is 31305023. The next prime is 31305031. The reversal of 31305028 is 82050313.

It can be written as a sum of positive squares in 2 ways, for example, as 5721664 + 25583364 = 2392^2 + 5058^2 .

It is not an unprimeable number, because it can be changed into a prime (31305023) 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, 53313 + ... + 53896.

Almost surely, 2^31305028 is an apocalyptic number.

It is an amenable number.

31305028 is a deficient number, since it is larger than the sum of its proper divisors (24229752).

31305028 is a wasteful number, since it uses less digits than its factorization.

31305028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107286 (or 107284 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 31305028 is about 5595.0896328835. The cubic root of 31305028 is about 315.1650365549.

It can be divided in two parts, 3 and 1305028, that added together give a palindrome (1305031).

The spelling of 31305028 in words is "thirty-one million, three hundred five thousand, twenty-eight".