61445779 has 8 divisors (see below), whose sum is σ = 63616320. Its totient is φ = 59311296.

The previous prime is 61445777. The next prime is 61445801. The reversal of 61445779 is 97754416.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61445779 - 2¹ = 61445777 is a prime.

It is a Duffinian number.

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5524 + ... + 12385.

It is an arithmetic number, because the mean of its divisors is an integer number (7952040).

Almost surely, 2^61445779 is an apocalyptic number.

61445779 is a deficient number, since it is larger than the sum of its proper divisors (2170541).

61445779 is a wasteful number, since it uses less digits than its factorization.

61445779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18029.

The product of its digits is 211680, while the sum is 43.

The square root of 61445779 is about 7838.7358036867. The cubic root of 61445779 is about 394.6063032407.

The spelling of 61445779 in words is "sixty-one million, four hundred forty-five thousand, seven hundred seventy-nine".