61720136 has 32 divisors (see below), whose sum is σ = 120463200. Its totient is φ = 29621760.

The previous prime is 61720133. The next prime is 61720159. The reversal of 61720136 is 63102716.

61720136 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (61720133) 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, 18776 + ... + 21816.

It is an arithmetic number, because the mean of its divisors is an integer number (3764475).

Almost surely, 2^61720136 is an apocalyptic number.

It is an amenable number.

61720136 is a deficient number, since it is larger than the sum of its proper divisors (58743064).

61720136 is a wasteful number, since it uses less digits than its factorization.

61720136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3149 (or 3145 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 61720136 is about 7856.2163921318. The cubic root of 61720136 is about 395.1927404186.

The spelling of 61720136 in words is "sixty-one million, seven hundred twenty thousand, one hundred thirty-six".