61447685 has 8 divisors (see below), whose sum is σ = 79409400. Its totient is φ = 45376704.

The previous prime is 61447681. The next prime is 61447699. The reversal of 61447685 is 58674416.

61447685 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 5527201 + 55920484 = 2351^2 + 7478^2 .

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 61447685 - 2² = 61447681 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61447681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 472610 + ... + 472739.

It is an arithmetic number, because the mean of its divisors is an integer number (9926175).

Almost surely, 2^61447685 is an apocalyptic number.

61447685 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

61447685 is a deficient number, since it is larger than the sum of its proper divisors (17961715).

61447685 is a wasteful number, since it uses less digits than its factorization.

61447685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 945367.

The product of its digits is 161280, while the sum is 41.

The square root of 61447685 is about 7838.8573784704. The cubic root of 61447685 is about 394.6103833248.

The spelling of 61447685 in words is "sixty-one million, four hundred forty-seven thousand, six hundred eighty-five".