31227680 has 72 divisors (see below), whose sum is σ = 81142236. Its totient is φ = 11348480.

The previous prime is 31227641. The next prime is 31227689. The reversal of 31227680 is 8672213.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 31225744 + 1936 = 5588^2 + 44^2 .

It is not an unprimeable number, because it can be changed into a prime (31227689) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18554 + ... + 20166.

Almost surely, 2^31227680 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 31227680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40571118).

31227680 is an abundant number, since it is smaller than the sum of its proper divisors (49914556).

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

31227680 is a wasteful number, since it uses less digits than its factorization.

31227680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1650 (or 1631 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 31227680 is about 5588.1732256615. The cubic root of 31227680 is about 314.9052541120.

Adding to 31227680 its reverse (8672213), we get a palindrome (39899893).

The spelling of 31227680 in words is "thirty-one million, two hundred twenty-seven thousand, six hundred eighty".