31060640 has 96 divisors (see below), whose sum is σ = 80332560. Its totient is φ = 11280384.

The previous prime is 31060633. The next prime is 31060669. The reversal of 31060640 is 4606013.

It can be written as a sum of positive squares in 8 ways, for example, as 11806096 + 19254544 = 3436^2 + 4388^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

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, 226652 + ... + 226788.

Almost surely, 2^31060640 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 31060640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40166280).

31060640 is an abundant number, since it is smaller than the sum of its proper divisors (49271920).

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

31060640 is a wasteful number, since it uses less digits than its factorization.

31060640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274 (or 266 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 31060640 is about 5573.2073350989. The cubic root of 31060640 is about 314.3427633550.

Adding to 31060640 its reverse (4606013), we get a palindrome (35666653).

The spelling of 31060640 in words is "thirty-one million, sixty thousand, six hundred forty".