5635661220 has 72 divisors (see below), whose sum is σ = 19536963264. Its totient is φ = 1288150848.

The previous prime is 5635661219. The next prime is 5635661257. The reversal of 5635661220 is 221665365.

It is a happy number.

5635661220 is a `hidden beast` number, since 5 + 6 + 35 + 6 + 612 + 2 + 0 = 666.

It is a super-2 number, since 2×5635661220² = 63521354773223776800, which contains 22 as substring.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2235114 + ... + 2237633.

It is an arithmetic number, because the mean of its divisors is an integer number (271346712).

Almost surely, 2^5635661220 is an apocalyptic number.

It is an amenable number.

5635661220 is an abundant number, since it is smaller than the sum of its proper divisors (13901302044).

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

5635661220 is a wasteful number, since it uses less digits than its factorization.

5635661220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4472769 (or 4472764 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The square root of 5635661220 is about 75071.0411543626. The cubic root of 5635661220 is about 1779.5695230529.

The spelling of 5635661220 in words is "five billion, six hundred thirty-five million, six hundred sixty-one thousand, two hundred twenty".