61644244 has 24 divisors (see below), whose sum is σ = 117911808. Its totient is φ = 28072320.

The previous prime is 61644223. The next prime is 61644263. The reversal of 61644244 is 44244616.

It is a Harshad number since it is a multiple of its sum of digits (31).

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, 12514 + ... + 16729.

It is an arithmetic number, because the mean of its divisors is an integer number (4912992).

Almost surely, 2^61644244 is an apocalyptic number.

It is an amenable number.

61644244 is a deficient number, since it is larger than the sum of its proper divisors (56267564).

61644244 is a wasteful number, since it uses less digits than its factorization.

61644244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29295 (or 29293 counting only the distinct ones).

The product of its digits is 18432, while the sum is 31.

The square root of 61644244 is about 7851.3848460001. The cubic root of 61644244 is about 395.0306956864.

The spelling of 61644244 in words is "sixty-one million, six hundred forty-four thousand, two hundred forty-four".