63172640 has 24 divisors (see below), whose sum is σ = 149245740. Its totient is φ = 25268992.

The previous prime is 63172639. The next prime is 63172649. The reversal of 63172640 is 4627136.

It can be written as a sum of positive squares in 2 ways, for example, as 63170704 + 1936 = 7948^2 + 44^2 .

It is not an unprimeable number, because it can be changed into a prime (63172649) 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 3 ways as a sum of consecutive naturals, for example, 197255 + ... + 197574.

Almost surely, 2^63172640 is an apocalyptic number.

It is an amenable number.

63172640 is an abundant number, since it is smaller than the sum of its proper divisors (86073100).

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

63172640 is a wasteful number, since it uses less digits than its factorization.

63172640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394844 (or 394836 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 63172640 is about 7948.1217907126. The cubic root of 63172640 is about 398.2688519579.

Adding to 63172640 its reverse (4627136), we get a palindrome (67799776).

The spelling of 63172640 in words is "sixty-three million, one hundred seventy-two thousand, six hundred forty".