61778443 has 16 divisors (see below), whose sum is σ = 68428800. Its totient is φ = 55542240.

The previous prime is 61778417. The next prime is 61778471. The reversal of 61778443 is 34487716.

It is a cyclic number.

It is not a de Polignac number, because 61778443 - 2¹³ = 61770251 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61778396 and 61778405.

It is not an unprimeable number, because it can be changed into a prime (61778243) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30228 + ... + 32206.

It is an arithmetic number, because the mean of its divisors is an integer number (4276800).

Almost surely, 2^61778443 is an apocalyptic number.

61778443 is a deficient number, since it is larger than the sum of its proper divisors (6650357).

61778443 is a wasteful number, since it uses less digits than its factorization.

61778443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2082.

The product of its digits is 112896, while the sum is 40.

The square root of 61778443 is about 7859.9263991465. The cubic root of 61778443 is about 395.3171474184.

The spelling of 61778443 in words is "sixty-one million, seven hundred seventy-eight thousand, four hundred forty-three".