61443616 has 48 divisors (see below), whose sum is σ = 131410944. Its totient is φ = 28111104.

The previous prime is 61443607. The next prime is 61443631. The reversal of 61443616 is 61634416.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52251 + ... + 53413.

It is an arithmetic number, because the mean of its divisors is an integer number (2737728).

Almost surely, 2^61443616 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61443616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65705472).

61443616 is an abundant number, since it is smaller than the sum of its proper divisors (69967328).

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

61443616 is a wasteful number, since it uses less digits than its factorization.

61443616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1313 (or 1305 counting only the distinct ones).

The product of its digits is 10368, while the sum is 31.

The square root of 61443616 is about 7838.5978337966. The cubic root of 61443616 is about 394.6016729067.

The spelling of 61443616 in words is "sixty-one million, four hundred forty-three thousand, six hundred sixteen".