63109840 has 20 divisors (see below), whose sum is σ = 146730564. Its totient is φ = 25243904.

The previous prime is 63109817. The next prime is 63109847. The reversal of 63109840 is 4890136.

It can be written as a sum of positive squares in 2 ways, for example, as 23116864 + 39992976 = 4808^2 + 6324^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63109847) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 394357 + ... + 394516.

Almost surely, 2^63109840 is an apocalyptic number.

It is an amenable number.

63109840 is an abundant number, since it is smaller than the sum of its proper divisors (83620724).

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

63109840 is a wasteful number, since it uses less digits than its factorization.

63109840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 788886 (or 788880 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 63109840 is about 7944.1701895163. The cubic root of 63109840 is about 398.1368350151.

Adding to 63109840 its reverse (4890136), we get a palindrome (67999976).

The spelling of 63109840 in words is "sixty-three million, one hundred nine thousand, eight hundred forty".