631542340 has 96 divisors (see below), whose sum is σ = 1564738560. Its totient is φ = 211084800.

The previous prime is 631542319. The next prime is 631542343. The reversal of 631542340 is 43245136.

It is a junction number, because it is equal to n+sod(n) for n = 631542299 and 631542308.

It is not an unprimeable number, because it can be changed into a prime (631542343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1318221 + ... + 1318699.

It is an arithmetic number, because the mean of its divisors is an integer number (16299360).

Almost surely, 2^631542340 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 631542340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (782369280).

631542340 is an abundant number, since it is smaller than the sum of its proper divisors (933196220).

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

631542340 is a wasteful number, since it uses less digits than its factorization.

631542340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 973 (or 971 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 631542340 is about 25130.5061628293. The cubic root of 631542340 is about 857.9608891781.

Adding to 631542340 its reverse (43245136), we get a palindrome (674787476).

The spelling of 631542340 in words is "six hundred thirty-one million, five hundred forty-two thousand, three hundred forty".