31378032 has 90 divisors (see below), whose sum is σ = 102175008. Its totient is φ = 8963136.

The previous prime is 31378031. The next prime is 31378051. The reversal of 31378032 is 23087313.

It is a junction number, because it is equal to n+sod(n) for n = 31377987 and 31378005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31378031) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4833 + ... + 9279.

Almost surely, 2^31378032 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 31378032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51087504).

31378032 is an abundant number, since it is smaller than the sum of its proper divisors (70796976).

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

31378032 is a wasteful number, since it uses less digits than its factorization.

31378032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4475 (or 4459 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 31378032 is about 5601.6097686290. The cubic root of 31378032 is about 315.4098369128.

The spelling of 31378032 in words is "thirty-one million, three hundred seventy-eight thousand, thirty-two".