31140028 has 12 divisors (see below), whose sum is σ = 54568080. Its totient is φ = 15549152.

The previous prime is 31139981. The next prime is 31140029. The reversal of 31140028 is 82004113.

It is a junction number, because it is equal to n+sod(n) for n = 31139987 and 31140014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31140029) 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, 1576 + ... + 8047.

It is an arithmetic number, because the mean of its divisors is an integer number (4547340).

Almost surely, 2^31140028 is an apocalyptic number.

It is an amenable number.

31140028 is a deficient number, since it is larger than the sum of its proper divisors (23428052).

31140028 is a wasteful number, since it uses less digits than its factorization.

31140028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10436 (or 10434 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 31140028 is about 5580.3250801365. The cubic root of 31140028 is about 314.6103454411.

The spelling of 31140028 in words is "thirty-one million, one hundred forty thousand, twenty-eight".