61644142 has 16 divisors (see below), whose sum is σ = 111892320. Its totient is φ = 24864768.

The previous prime is 61644139. The next prime is 61644157. The reversal of 61644142 is 24144616.

It is a self number, because there is not a number n which added to its sum of digits gives 61644142.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129267 + ... + 129742.

It is an arithmetic number, because the mean of its divisors is an integer number (6993270).

Almost surely, 2^61644142 is an apocalyptic number.

61644142 is a deficient number, since it is larger than the sum of its proper divisors (50248178).

61644142 is a wasteful number, since it uses less digits than its factorization.

61644142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259035.

The product of its digits is 4608, while the sum is 28.

The square root of 61644142 is about 7851.3783503280. The cubic root of 61644142 is about 395.0304778064.

Adding to 61644142 its reverse (24144616), we get a palindrome (85788758).

The spelling of 61644142 in words is "sixty-one million, six hundred forty-four thousand, one hundred forty-two".