61445770 has 16 divisors (see below), whose sum is σ = 110759400. Its totient is φ = 24543424.

The previous prime is 61445749. The next prime is 61445771. The reversal of 61445770 is 7754416.

It is a happy number.

61445770 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 33535681 + 27910089 = 5791^2 + 5283^2 .

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, 3756 + ... + 11704.

Almost surely, 2^61445770 is an apocalyptic number.

61445770 is a deficient number, since it is larger than the sum of its proper divisors (49313630).

61445770 is a wasteful number, since it uses less digits than its factorization.

61445770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8729.

The product of its (nonzero) digits is 23520, while the sum is 34.

The square root of 61445770 is about 7838.7352296145. The cubic root of 61445770 is about 394.6062839747.

The spelling of 61445770 in words is "sixty-one million, four hundred forty-five thousand, seven hundred seventy".