31142028 has 24 divisors (see below), whose sum is σ = 76939632. Its totient is φ = 9769984.

The previous prime is 31142021. The next prime is 31142039. The reversal of 31142028 is 82024113.

It is a junction number, because it is equal to n+sod(n) for n = 31141995 and 31142013.

It is not an unprimeable number, because it can be changed into a prime (31142021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76125 + ... + 76532.

It is an arithmetic number, because the mean of its divisors is an integer number (3205818).

Almost surely, 2^31142028 is an apocalyptic number.

It is an amenable number.

31142028 is an abundant number, since it is smaller than the sum of its proper divisors (45797604).

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

31142028 is a wasteful number, since it uses less digits than its factorization.

31142028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152681 (or 152679 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 31142028 is about 5580.5042782888. The cubic root of 31142028 is about 314.6170806868.

The spelling of 31142028 in words is "thirty-one million, one hundred forty-two thousand, twenty-eight".