31371428 has 18 divisors (see below), whose sum is σ = 60345558. Its totient is φ = 14259520.

The previous prime is 31371407. The next prime is 31371497. The reversal of 31371428 is 82417313.

It can be written as a sum of positive squares in only one way, i.e., 24285184 + 7086244 = 4928^2 + 2662^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 31371428.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 31925 + ... + 32892.

It is an arithmetic number, because the mean of its divisors is an integer number (3352531).

Almost surely, 2^31371428 is an apocalyptic number.

It is an amenable number.

31371428 is a deficient number, since it is larger than the sum of its proper divisors (28974130).

31371428 is a wasteful number, since it uses less digits than its factorization.

31371428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64843 (or 64830 counting only the distinct ones).

The product of its digits is 4032, while the sum is 29.

The square root of 31371428 is about 5601.0202642019. The cubic root of 31371428 is about 315.3877077077.

The spelling of 31371428 in words is "thirty-one million, three hundred seventy-one thousand, four hundred twenty-eight".