61081272 has 96 divisors (see below), whose sum is σ = 200210400. Its totient is φ = 16422912.

The previous prime is 61081243. The next prime is 61081291. The reversal of 61081272 is 27218016.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 5004 + ... + 12132.

It is an arithmetic number, because the mean of its divisors is an integer number (2085525).

Almost surely, 2^61081272 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 61081272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100105200).

61081272 is an abundant number, since it is smaller than the sum of its proper divisors (139129128).

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

61081272 is a wasteful number, since it uses less digits than its factorization.

61081272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7165 (or 7158 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 61081272 is about 7815.4508507187. The cubic root of 61081272 is about 393.8244642237.

Adding to 61081272 its reverse (27218016), we get a palindrome (88299288).

The spelling of 61081272 in words is "sixty-one million, eighty-one thousand, two hundred seventy-two".