61445856 has 24 divisors (see below), whose sum is σ = 161295624. Its totient is φ = 20481920.

The previous prime is 61445831. The next prime is 61445887. The reversal of 61445856 is 65854416.

It is a happy number.

61445856 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (24).

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 3 ways as a sum of consecutive naturals, for example, 319935 + ... + 320126.

It is an arithmetic number, because the mean of its divisors is an integer number (6720651).

Almost surely, 2^61445856 is an apocalyptic number.

It is an amenable number.

61445856 is an abundant number, since it is smaller than the sum of its proper divisors (99849768).

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

61445856 is a wasteful number, since it uses less digits than its factorization.

61445856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640074 (or 640066 counting only the distinct ones).

The product of its digits is 115200, while the sum is 39.

The square root of 61445856 is about 7838.7407151914. The cubic root of 61445856 is about 394.6064680726.

The spelling of 61445856 in words is "sixty-one million, four hundred forty-five thousand, eight hundred fifty-six".