63636660 has 72 divisors (see below), whose sum is σ = 193775400. Its totient is φ = 16904448.

The previous prime is 63636659. The next prime is 63636673. The reversal of 63636660 is 6663636.

It can be written as a sum of positive squares in 4 ways, for example, as 338724 + 63297936 = 582^2 + 7956^2 .

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 62314 + ... + 63326.

It is an arithmetic number, because the mean of its divisors is an integer number (2691325).

Almost surely, 2^63636660 is an apocalyptic number.

63636660 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 63636660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96887700).

63636660 is an abundant number, since it is smaller than the sum of its proper divisors (130138740).

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

63636660 is a wasteful number, since it uses less digits than its factorization.

63636660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1377 (or 1372 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 36.

The square root of 63636660 is about 7977.2589277270. The cubic root of 63636660 is about 399.2416046667.

The spelling of 63636660 in words is "sixty-three million, six hundred thirty-six thousand, six hundred sixty".