61681747 has 8 divisors (see below), whose sum is σ = 62720352. Its totient is φ = 60648000.

The previous prime is 61681721. The next prime is 61681751. The reversal of 61681747 is 74718616.

61681747 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 61681747 - 2¹¹ = 61679699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61681777) 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, 31497 + ... + 33397.

It is an arithmetic number, because the mean of its divisors is an integer number (7840044).

Almost surely, 2^61681747 is an apocalyptic number.

61681747 is a deficient number, since it is larger than the sum of its proper divisors (1038605).

61681747 is a wasteful number, since it uses less digits than its factorization.

61681747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2429.

The product of its digits is 56448, while the sum is 40.

The square root of 61681747 is about 7853.7727876480. The cubic root of 61681747 is about 395.1107887705.

The spelling of 61681747 in words is "sixty-one million, six hundred eighty-one thousand, seven hundred forty-seven".