31378230 has 72 divisors (see below), whose sum is σ = 88384608. Its totient is φ = 7720128.

The previous prime is 31378223. The next prime is 31378307. The reversal of 31378230 is 3287313.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31378194 and 31378203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 14179 + ... + 16241.

It is an arithmetic number, because the mean of its divisors is an integer number (1227564).

Almost surely, 2^31378230 is an apocalyptic number.

31378230 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 31378230, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44192304).

31378230 is an abundant number, since it is smaller than the sum of its proper divisors (57006378).

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

31378230 is a wasteful number, since it uses less digits than its factorization.

31378230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2102 (or 2086 counting only the distinct ones).

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

The square root of 31378230 is about 5601.6274420922. The cubic root of 31378230 is about 315.4105003389.

The spelling of 31378230 in words is "thirty-one million, three hundred seventy-eight thousand, two hundred thirty".