63281340 has 36 divisors (see below), whose sum is σ = 191953944. Its totient is φ = 16874976.

The previous prime is 63281329. The next prime is 63281341. The reversal of 63281340 is 4318236.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63281341) 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, 175602 + ... + 175961.

It is an arithmetic number, because the mean of its divisors is an integer number (5332054).

Almost surely, 2^63281340 is an apocalyptic number.

63281340 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

63281340 is an abundant number, since it is smaller than the sum of its proper divisors (128672604).

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

63281340 is a wasteful number, since it uses less digits than its factorization.

63281340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351578 (or 351573 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 63281340 is about 7954.9569452009. The cubic root of 63281340 is about 398.4971523605.

Adding to 63281340 its reverse (4318236), we get a palindrome (67599576).

The spelling of 63281340 in words is "sixty-three million, two hundred eighty-one thousand, three hundred forty".