31127028 has 12 divisors (see below), whose sum is σ = 72629760. Its totient is φ = 10375672.

The previous prime is 31127003. The next prime is 31127029. The reversal of 31127028 is 82072113.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×31127028² = 1937783744225568, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31126989 and 31127007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31127029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1296948 + ... + 1296971.

It is an arithmetic number, because the mean of its divisors is an integer number (6052480).

Almost surely, 2^31127028 is an apocalyptic number.

It is an amenable number.

31127028 is an abundant number, since it is smaller than the sum of its proper divisors (41502732).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31127028 is a wasteful number, since it uses less digits than its factorization.

31127028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2593926 (or 2593924 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 31127028 is about 5579.1601518508. The cubic root of 31127028 is about 314.5665593130.

The spelling of 31127028 in words is "thirty-one million, one hundred twenty-seven thousand, twenty-eight".