61536220 has 12 divisors (see below), whose sum is σ = 129226104. Its totient is φ = 24614480.

The previous prime is 61536187. The next prime is 61536239. The reversal of 61536220 is 2263516.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1538386 + ... + 1538425.

It is an arithmetic number, because the mean of its divisors is an integer number (10768842).

Almost surely, 2^61536220 is an apocalyptic number.

It is an amenable number.

61536220 is an abundant number, since it is smaller than the sum of its proper divisors (67689884).

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

61536220 is a wasteful number, since it uses less digits than its factorization.

61536220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3076820 (or 3076818 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 61536220 is about 7844.5025336219. The cubic root of 61536220 is about 394.7998131056.

Adding to 61536220 its reverse (2263516), we get a palindrome (63799736).

The spelling of 61536220 in words is "sixty-one million, five hundred thirty-six thousand, two hundred twenty".