61027780 has 48 divisors (see below), whose sum is σ = 140345856. Its totient is φ = 22106880.

The previous prime is 61027727. The next prime is 61027783. The reversal of 61027780 is 8772016.

It is a happy number.

61027780 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (61027783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100237 + ... + 100843.

It is an arithmetic number, because the mean of its divisors is an integer number (2923872).

Almost surely, 2^61027780 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61027780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70172928).

61027780 is an abundant number, since it is smaller than the sum of its proper divisors (79318076).

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

61027780 is a wasteful number, since it uses less digits than its factorization.

61027780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1084 (or 1082 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 31.

The square root of 61027780 is about 7812.0279057361. The cubic root of 61027780 is about 393.7094665590.

Adding to 61027780 its reverse (8772016), we get a palindrome (69799796).

The spelling of 61027780 in words is "sixty-one million, twenty-seven thousand, seven hundred eighty".