61644441 has 16 divisors (see below), whose sum is σ = 83378880. Its totient is φ = 40507200.

The previous prime is 61644421. The next prime is 61644449. The reversal of 61644441 is 14444616.

It is not a de Polignac number, because 61644441 - 2⁵ = 61644409 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 61644399 and 61644408.

It is not an unprimeable number, because it can be changed into a prime (61644449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 117606 + ... + 118128.

It is an arithmetic number, because the mean of its divisors is an integer number (5211180).

Almost surely, 2^61644441 is an apocalyptic number.

It is an amenable number.

61644441 is a deficient number, since it is larger than the sum of its proper divisors (21734439).

61644441 is a wasteful number, since it uses less digits than its factorization.

61644441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1016.

The product of its digits is 9216, while the sum is 30.

The square root of 61644441 is about 7851.3973915476. The cubic root of 61644441 is about 395.0311164933.

The spelling of 61644441 in words is "sixty-one million, six hundred forty-four thousand, four hundred forty-one".