61445778 has 16 divisors (see below), whose sum is σ = 124273440. Its totient is φ = 20251616.

The previous prime is 61445777. The next prime is 61445801. The reversal of 61445778 is 87754416.

61445778 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (61445771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57000 + ... + 58067.

It is an arithmetic number, because the mean of its divisors is an integer number (7767090).

Almost surely, 2^61445778 is an apocalyptic number.

61445778 is an abundant number, since it is smaller than the sum of its proper divisors (62827662).

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

61445778 is a wasteful number, since it uses less digits than its factorization.

61445778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115161.

The product of its digits is 188160, while the sum is 42.

The square root of 61445778 is about 7838.7357399009. The cubic root of 61445778 is about 394.6063011001.

The spelling of 61445778 in words is "sixty-one million, four hundred forty-five thousand, seven hundred seventy-eight".