61205550 has 96 divisors (see below), whose sum is σ = 176131584. Its totient is φ = 13776000.

The previous prime is 61205549. The next prime is 61205569. The reversal of 61205550 is 5550216.

It is a super-2 number, since 2×61205550² = 7492238701605000, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 61205550.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 74140 + ... + 74960.

It is an arithmetic number, because the mean of its divisors is an integer number (1834704).

Almost surely, 2^61205550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61205550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88065792).

61205550 is an abundant number, since it is smaller than the sum of its proper divisors (114926034).

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

61205550 is a wasteful number, since it uses less digits than its factorization.

61205550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 914 (or 909 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 24.

The square root of 61205550 is about 7823.3975995088. The cubic root of 61205550 is about 394.0913794251.

Adding to 61205550 its reverse (5550216), we get a palindrome (66755766).

The spelling of 61205550 in words is "sixty-one million, two hundred five thousand, five hundred fifty".