61222540 has 48 divisors (see below), whose sum is σ = 132545952. Its totient is φ = 23740416.

The previous prime is 61222537. The next prime is 61222547. The reversal of 61222540 is 4522216.

61222540 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 (61222547) 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, 220882 + ... + 221158.

It is an arithmetic number, because the mean of its divisors is an integer number (2761374).

Almost surely, 2^61222540 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 61222540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66272976).

61222540 is an abundant number, since it is smaller than the sum of its proper divisors (71323412).

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

61222540 is a wasteful number, since it uses less digits than its factorization.

61222540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 586 (or 584 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 61222540 is about 7824.4833695267. The cubic root of 61222540 is about 394.1278412225.

Adding to 61222540 its reverse (4522216), we get a palindrome (65744756).

The spelling of 61222540 in words is "sixty-one million, two hundred twenty-two thousand, five hundred forty".