61571816 has 8 divisors (see below), whose sum is σ = 115447170. Its totient is φ = 30785904.

The previous prime is 61571813. The next prime is 61571827. The reversal of 61571816 is 61817516.

61571816 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 only one way, i.e., 61559716 + 12100 = 7846^2 + 110^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (61571813) 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 as a sum of consecutive naturals, namely, 3848231 + ... + 3848246.

Almost surely, 2^61571816 is an apocalyptic number.

It is an amenable number.

61571816 is a deficient number, since it is larger than the sum of its proper divisors (53875354).

61571816 is a wasteful number, since it uses less digits than its factorization.

61571816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7696483 (or 7696479 counting only the distinct ones).

The product of its digits is 10080, while the sum is 35.

The square root of 61571816 is about 7846.7710556636. The cubic root of 61571816 is about 394.8759232148.

The spelling of 61571816 in words is "sixty-one million, five hundred seventy-one thousand, eight hundred sixteen".