61908709 has 8 divisors (see below), whose sum is σ = 64720512. Its totient is φ = 59106960.

The previous prime is 61908703. The next prime is 61908719. The reversal of 61908709 is 90780916.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61908709 - 2⁵ = 61908677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61908703) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11904 + ... + 16294.

It is an arithmetic number, because the mean of its divisors is an integer number (8090064).

Almost surely, 2^61908709 is an apocalyptic number.

It is an amenable number.

61908709 is a deficient number, since it is larger than the sum of its proper divisors (2811803).

61908709 is a wasteful number, since it uses less digits than its factorization.

61908709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5027.

The product of its (nonzero) digits is 27216, while the sum is 40.

The square root of 61908709 is about 7868.2087542210. The cubic root of 61908709 is about 395.5948075443.

The spelling of 61908709 in words is "sixty-one million, nine hundred eight thousand, seven hundred nine".