61443220 has 12 divisors (see below), whose sum is σ = 129030804. Its totient is φ = 24577280.

The previous prime is 61443211. The next prime is 61443233. The reversal of 61443220 is 2234416.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 43903876 + 17539344 = 6626^2 + 4188^2 .

It is a junction number, because it is equal to n+sod(n) for n = 61443191 and 61443200.

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, 1536061 + ... + 1536100.

It is an arithmetic number, because the mean of its divisors is an integer number (10752567).

Almost surely, 2^61443220 is an apocalyptic number.

It is an amenable number.

61443220 is an abundant number, since it is smaller than the sum of its proper divisors (67587584).

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

61443220 is a wasteful number, since it uses less digits than its factorization.

61443220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3072170 (or 3072168 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 61443220 is about 7838.5725741362. The cubic root of 61443220 is about 394.6008251777.

Adding to 61443220 its reverse (2234416), we get a palindrome (63677636).

It can be divided in two parts, 614 and 43220, that added together give a palindrome (43834).

The spelling of 61443220 in words is "sixty-one million, four hundred forty-three thousand, two hundred twenty".