61445780 has 48 divisors (see below), whose sum is σ = 145635840. Its totient is φ = 21571200.

The previous prime is 61445777. The next prime is 61445801. The reversal of 61445780 is 8754416.

61445780 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 61445780.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1565 + ... + 11195.

It is an arithmetic number, because the mean of its divisors is an integer number (3034080).

Almost surely, 2^61445780 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61445780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72817920).

61445780 is an abundant number, since it is smaller than the sum of its proper divisors (84190060).

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

61445780 is a wasteful number, since it uses less digits than its factorization.

61445780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9680 (or 9678 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 61445780 is about 7838.7358674725. The cubic root of 61445780 is about 394.6063053814.

The spelling of 61445780 in words is "sixty-one million, four hundred forty-five thousand, seven hundred eighty".