61561344 has 80 divisors (see below), whose sum is σ = 176676192. Its totient is φ = 18935808.

The previous prime is 61561343. The next prime is 61561373. The reversal of 61561344 is 44316516.

It is not an unprimeable number, because it can be changed into a prime (61561343) by changing a digit.

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, 18427 + ... + 21509.

Almost surely, 2^61561344 is an apocalyptic number.

61561344 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61561344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88338096).

61561344 is an abundant number, since it is smaller than the sum of its proper divisors (115114848).

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

61561344 is a wasteful number, since it uses less digits than its factorization.

61561344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3117 (or 3101 counting only the distinct ones).

The product of its digits is 8640, while the sum is 30.

The square root of 61561344 is about 7846.1037464464. The cubic root of 61561344 is about 394.8535354007.

The spelling of 61561344 in words is "sixty-one million, five hundred sixty-one thousand, three hundred forty-four".