61685608 has 8 divisors (see below), whose sum is σ = 115660530. Its totient is φ = 30842800.

The previous prime is 61685539. The next prime is 61685651. The reversal of 61685608 is 80658616.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 33616804 + 28068804 = 5798^2 + 5298^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×61685608² = 7610228468659328, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3855343 + ... + 3855358.

Almost surely, 2^61685608 is an apocalyptic number.

It is an amenable number.

61685608 is a deficient number, since it is larger than the sum of its proper divisors (53974922).

61685608 is a wasteful number, since it uses less digits than its factorization.

61685608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7710707 (or 7710703 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 61685608 is about 7854.0185892319. The cubic root of 61685608 is about 395.1190326514.

The spelling of 61685608 in words is "sixty-one million, six hundred eighty-five thousand, six hundred eight".