31422320 has 80 divisors (see below), whose sum is σ = 76387968. Its totient is φ = 12011520.

The previous prime is 31422317. The next prime is 31422323. The reversal of 31422320 is 2322413.

It is an interprime number because it is at equal distance from previous prime (31422317) and next prime (31422323).

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 (31422323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 229292 + ... + 229428.

Almost surely, 2^31422320 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 31422320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38193984).

31422320 is an abundant number, since it is smaller than the sum of its proper divisors (44965648).

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

31422320 is a wasteful number, since it uses less digits than its factorization.

31422320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258 (or 252 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 31422320 is about 5605.5615240580. The cubic root of 31422320 is about 315.5581604699.

Adding to 31422320 its reverse (2322413), we get a palindrome (33744733).

The spelling of 31422320 in words is "thirty-one million, four hundred twenty-two thousand, three hundred twenty".