61186720 has 48 divisors (see below), whose sum is σ = 165207168. Its totient is φ = 20977920.

The previous prime is 61186711. The next prime is 61186733. The reversal of 61186720 is 2768116.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26196 + ... + 28435.

It is an arithmetic number, because the mean of its divisors is an integer number (3441816).

Almost surely, 2^61186720 is an apocalyptic number.

It is an amenable number.

61186720 is an abundant number, since it is smaller than the sum of its proper divisors (104020448).

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

61186720 is a wasteful number, since it uses less digits than its factorization.

61186720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54653 (or 54645 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 61186720 is about 7822.1940656059. The cubic root of 61186720 is about 394.0509609674.

The spelling of 61186720 in words is "sixty-one million, one hundred eighty-six thousand, seven hundred twenty".