61227220 has 24 divisors (see below), whose sum is σ = 128759904. Its totient is φ = 24456096.

The previous prime is 61227211. The next prime is 61227223. The reversal of 61227220 is 2272216.

It is a junction number, because it is equal to n+sod(n) for n = 61227191 and 61227200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61227223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15927 + ... + 19393.

It is an arithmetic number, because the mean of its divisors is an integer number (5364996).

Almost surely, 2^61227220 is an apocalyptic number.

It is an amenable number.

61227220 is an abundant number, since it is smaller than the sum of its proper divisors (67532684).

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

61227220 is a wasteful number, since it uses less digits than its factorization.

61227220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4359 (or 4357 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 61227220 is about 7824.7824250902. The cubic root of 61227220 is about 394.1378836638.

Adding to 61227220 its reverse (2272216), we get a palindrome (63499436).

The spelling of 61227220 in words is "sixty-one million, two hundred twenty-seven thousand, two hundred twenty".