61908613 has 8 divisors (see below), whose sum is σ = 66747128. Its totient is φ = 57081024.

The previous prime is 61908589. The next prime is 61908619. The reversal of 61908613 is 31680916.

It can be written as a sum of positive squares in 4 ways, for example, as 38415204 + 23493409 = 6198^2 + 4847^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-61908613 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 (61908619) 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, 12031 + ... + 16387.

It is an arithmetic number, because the mean of its divisors is an integer number (8343391).

Almost surely, 2^61908613 is an apocalyptic number.

It is an amenable number.

61908613 is a deficient number, since it is larger than the sum of its proper divisors (4838515).

61908613 is a wasteful number, since it uses less digits than its factorization.

61908613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5463.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 61908613 is about 7868.2026537196. The cubic root of 61908613 is about 395.5946030651.

The spelling of 61908613 in words is "sixty-one million, nine hundred eight thousand, six hundred thirteen".