31378630 has 8 divisors (see below), whose sum is σ = 56481552. Its totient is φ = 12551448.

The previous prime is 31378621. The next prime is 31378637. The reversal of 31378630 is 3687313.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 31378592 and 31378601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31378637) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1568922 + ... + 1568941.

It is an arithmetic number, because the mean of its divisors is an integer number (7060194).

Almost surely, 2^31378630 is an apocalyptic number.

31378630 is a deficient number, since it is larger than the sum of its proper divisors (25102922).

31378630 is a wasteful number, since it uses less digits than its factorization.

31378630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3137870.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 31378630 is about 5601.6631458880. The cubic root of 31378630 is about 315.4118405851.

The spelling of 31378630 in words is "thirty-one million, three hundred seventy-eight thousand, six hundred thirty".