31390328 has 8 divisors (see below), whose sum is σ = 58856880. Its totient is φ = 15695160.

The previous prime is 31390309. The next prime is 31390343. The reversal of 31390328 is 82309313.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 31390328.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 1961888 + ... + 1961903.

It is an arithmetic number, because the mean of its divisors is an integer number (7357110).

Almost surely, 2^31390328 is an apocalyptic number.

It is an amenable number.

31390328 is a deficient number, since it is larger than the sum of its proper divisors (27466552).

31390328 is a wasteful number, since it uses less digits than its factorization.

31390328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3923797 (or 3923793 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 31390328 is about 5602.7072027726. The cubic root of 31390328 is about 315.4510310501.

The spelling of 31390328 in words is "thirty-one million, three hundred ninety thousand, three hundred twenty-eight".