61644443 has 8 divisors (see below), whose sum is σ = 72169440. Its totient is φ = 51549120.

The previous prime is 61644421. The next prime is 61644449. The reversal of 61644443 is 34444616.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61644443 - 2¹⁴ = 61628059 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 107108 + ... + 107681.

It is an arithmetic number, because the mean of its divisors is an integer number (9021180).

Almost surely, 2^61644443 is an apocalyptic number.

61644443 is a deficient number, since it is larger than the sum of its proper divisors (10524997).

61644443 is a wasteful number, since it uses less digits than its factorization.

61644443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214837.

The product of its digits is 27648, while the sum is 32.

The square root of 61644443 is about 7851.3975189134. The cubic root of 61644443 is about 395.0311207655.

The spelling of 61644443 in words is "sixty-one million, six hundred forty-four thousand, four hundred forty-three".