31378000 has 80 divisors (see below), whose sum is σ = 78633360. Its totient is φ = 12096000.

The previous prime is 31377991. The next prime is 31378007. The reversal of 31378000 is 87313.

It can be written as a sum of positive squares in 8 ways, for example, as 11343424 + 20034576 = 3368^2 + 4476^2 .

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31378007) 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 15 ways as a sum of consecutive naturals, for example, 57730 + ... + 58270.

It is an arithmetic number, because the mean of its divisors is an integer number (982917).

Almost surely, 2^31378000 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 31378000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39316680).

31378000 is an abundant number, since it is smaller than the sum of its proper divisors (47255360).

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

31378000 is a wasteful number, since it uses less digits than its factorization.

31378000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 593 (or 577 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 31378000 is about 5601.6069123065. The cubic root of 31378000 is about 315.4097296921.

The spelling of 31378000 in words is "thirty-one million, three hundred seventy-eight thousand".