31330428 has 24 divisors (see below), whose sum is σ = 73323600. Its totient is φ = 10412160.

The previous prime is 31330427. The next prime is 31330433. The reversal of 31330428 is 82403313.

It is a junction number, because it is equal to n+sod(n) for n = 31330398 and 31330407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31330421) 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 7 ways as a sum of consecutive naturals, for example, 448 + ... + 7928.

It is an arithmetic number, because the mean of its divisors is an integer number (3055150).

Almost surely, 2^31330428 is an apocalyptic number.

It is an amenable number.

31330428 is an abundant number, since it is smaller than the sum of its proper divisors (41993172).

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

31330428 is a wasteful number, since it uses less digits than its factorization.

31330428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7837 (or 7835 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 31330428 is about 5597.3590201094. The cubic root of 31330428 is about 315.2502521295.

The spelling of 31330428 in words is "thirty-one million, three hundred thirty thousand, four hundred twenty-eight".