61707709 has 12 divisors (see below), whose sum is σ = 73454304. Its totient is φ = 51660504.

The previous prime is 61707691. The next prime is 61707713. The reversal of 61707709 is 90770716.

It is not a de Polignac number, because 61707709 - 2¹⁵ = 61674941 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61707719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12537 + ... + 16750.

It is an arithmetic number, because the mean of its divisors is an integer number (6121192).

Almost surely, 2^61707709 is an apocalyptic number.

It is an amenable number.

61707709 is a deficient number, since it is larger than the sum of its proper divisors (11746595).

61707709 is a wasteful number, since it uses less digits than its factorization.

61707709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29344 (or 29337 counting only the distinct ones).

The product of its (nonzero) digits is 18522, while the sum is 37.

The square root of 61707709 is about 7855.4254499677. The cubic root of 61707709 is about 395.1662153646.

The spelling of 61707709 in words is "sixty-one million, seven hundred seven thousand, seven hundred nine".