63661040 has 20 divisors (see below), whose sum is σ = 148012104. Its totient is φ = 25464384.

The previous prime is 63660977. The next prime is 63661049. The reversal of 63661040 is 4016636.

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 (63661049) 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, 397802 + ... + 397961.

Almost surely, 2^63661040 is an apocalyptic number.

It is an amenable number.

63661040 is an abundant number, since it is smaller than the sum of its proper divisors (84351064).

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

63661040 is a wasteful number, since it uses less digits than its factorization.

63661040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 795776 (or 795770 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 63661040 is about 7978.7868752085. The cubic root of 63661040 is about 399.2925829738.

Adding to 63661040 its reverse (4016636), we get a palindrome (67677676).

The spelling of 63661040 in words is "sixty-three million, six hundred sixty-one thousand, forty".