61778944 has 22 divisors (see below), whose sum is σ = 123499604. Its totient is φ = 30888960.

The previous prime is 61778929. The next prime is 61778947. The reversal of 61778944 is 44987716.

It is a junction number, because it is equal to n+sod(n) for n = 61778894 and 61778903.

It is not an unprimeable number, because it can be changed into a prime (61778947) 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 as a sum of consecutive naturals, namely, 29142 + ... + 31189.

Almost surely, 2^61778944 is an apocalyptic number.

61778944 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

61778944 is a deficient number, since it is larger than the sum of its proper divisors (61720660).

61778944 is an equidigital number, since it uses as much as digits as its factorization.

61778944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60351 (or 60333 counting only the distinct ones).

The product of its digits is 338688, while the sum is 46.

The square root of 61778944 is about 7859.9582696093. The cubic root of 61778944 is about 395.3182160401.

The spelling of 61778944 in words is "sixty-one million, seven hundred seventy-eight thousand, nine hundred forty-four".