61681336 has 8 divisors (see below), whose sum is σ = 115652520. Its totient is φ = 30840664.

The previous prime is 61681313. The next prime is 61681337. The reversal of 61681336 is 63318616.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61681337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3855076 + ... + 3855091.

It is an arithmetic number, because the mean of its divisors is an integer number (14456565).

Almost surely, 2^61681336 is an apocalyptic number.

It is an amenable number.

61681336 is a deficient number, since it is larger than the sum of its proper divisors (53971184).

61681336 is a wasteful number, since it uses less digits than its factorization.

61681336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7710173 (or 7710169 counting only the distinct ones).

The product of its digits is 15552, while the sum is 34.

The square root of 61681336 is about 7853.7466218360. The cubic root of 61681336 is about 395.1099111965.

The spelling of 61681336 in words is "sixty-one million, six hundred eighty-one thousand, three hundred thirty-six".