61561272 has 16 divisors (see below), whose sum is σ = 153903240. Its totient is φ = 20520416.

The previous prime is 61561259. The next prime is 61561289. The reversal of 61561272 is 27216516.

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, 1282503 + ... + 1282550.

Almost surely, 2^61561272 is an apocalyptic number.

It is an amenable number.

61561272 is an abundant number, since it is smaller than the sum of its proper divisors (92341968).

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

61561272 is a wasteful number, since it uses less digits than its factorization.

61561272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2565062 (or 2565058 counting only the distinct ones).

The product of its digits is 5040, while the sum is 30.

The square root of 61561272 is about 7846.0991581805. The cubic root of 61561272 is about 394.8533814650.

Adding to 61561272 its reverse (27216516), we get a palindrome (88777788).

The spelling of 61561272 in words is "sixty-one million, five hundred sixty-one thousand, two hundred seventy-two".