31445028 has 36 divisors (see below), whose sum is σ = 79672320. Its totient is φ = 10457136.

The previous prime is 31445027. The next prime is 31445033. The reversal of 31445028 is 82054413.

It is a tau number, because it is divible by the number of its divisors (36).

It is a junction number, because it is equal to n+sod(n) for n = 31444992 and 31445010.

It is not an unprimeable number, because it can be changed into a prime (31445027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21133 + ... + 22571.

It is an arithmetic number, because the mean of its divisors is an integer number (2213120).

Almost surely, 2^31445028 is an apocalyptic number.

It is an amenable number.

31445028 is an abundant number, since it is smaller than the sum of its proper divisors (48227292).

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

31445028 is a wasteful number, since it uses less digits than its factorization.

31445028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2056 (or 2051 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 31445028 is about 5607.5866466779. The cubic root of 31445028 is about 315.6341570784.

The spelling of 31445028 in words is "thirty-one million, four hundred forty-five thousand, twenty-eight".