61811872 has 24 divisors (see below), whose sum is σ = 122103072. Its totient is φ = 30801600.

The previous prime is 61811839. The next prime is 61811903. The reversal of 61811872 is 27811816.

61811872 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 6847 + ... + 13057.

It is an arithmetic number, because the mean of its divisors is an integer number (5087628).

Almost surely, 2^61811872 is an apocalyptic number.

It is an amenable number.

61811872 is a deficient number, since it is larger than the sum of its proper divisors (60291200).

61811872 is a wasteful number, since it uses less digits than its factorization.

61811872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6532 (or 6524 counting only the distinct ones).

The product of its digits is 5376, while the sum is 34.

The square root of 61811872 is about 7862.0526581803. The cubic root of 61811872 is about 395.3884380574.

The spelling of 61811872 in words is "sixty-one million, eight hundred eleven thousand, eight hundred seventy-two".