61720017 has 12 divisors (see below), whose sum is σ = 86029104. Its totient is φ = 39356680.

The previous prime is 61719991. The next prime is 61720019. The reversal of 61720017 is 71002716.

It is not a de Polignac number, because 61720017 - 2⁶ = 61719953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61720019) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17859 + ... + 21032.

It is an arithmetic number, because the mean of its divisors is an integer number (7169092).

Almost surely, 2^61720017 is an apocalyptic number.

It is an amenable number.

61720017 is a deficient number, since it is larger than the sum of its proper divisors (24309087).

61720017 is a wasteful number, since it uses less digits than its factorization.

61720017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38940 (or 38917 counting only the distinct ones).

The product of its (nonzero) digits is 588, while the sum is 24.

The square root of 61720017 is about 7856.2088185078. The cubic root of 61720017 is about 395.1924864336.

The spelling of 61720017 in words is "sixty-one million, seven hundred twenty thousand, seventeen".