31427328 has 72 divisors (see below), whose sum is σ = 84507136. Its totient is φ = 10368000.

The previous prime is 31427327. The next prime is 31427351. The reversal of 31427328 is 82372413.

It is a junction number, because it is equal to n+sod(n) for n = 31427295 and 31427304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31427327) 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, 115833 + ... + 116103.

Almost surely, 2^31427328 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31427328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42253568).

31427328 is an abundant number, since it is smaller than the sum of its proper divisors (53079808).

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

31427328 is a wasteful number, since it uses less digits than its factorization.

31427328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441 (or 427 counting only the distinct ones).

The product of its digits is 8064, while the sum is 30.

The square root of 31427328 is about 5606.0082054881. The cubic root of 31427328 is about 315.5749238334.

The spelling of 31427328 in words is "thirty-one million, four hundred twenty-seven thousand, three hundred twenty-eight".