61705947 has 4 divisors (see below), whose sum is σ = 82274600. Its totient is φ = 41137296.

The previous prime is 61705921. The next prime is 61705967. The reversal of 61705947 is 74950716.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 61705947 - 2⁶ = 61705883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61705907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10284322 + ... + 10284327.

It is an arithmetic number, because the mean of its divisors is an integer number (20568650).

Almost surely, 2^61705947 is an apocalyptic number.

61705947 is a deficient number, since it is larger than the sum of its proper divisors (20568653).

61705947 is a wasteful number, since it uses less digits than its factorization.

61705947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20568652.

The product of its (nonzero) digits is 52920, while the sum is 39.

The square root of 61705947 is about 7855.3132973803. The cubic root of 61705947 is about 395.1624541408.

The spelling of 61705947 in words is "sixty-one million, seven hundred five thousand, nine hundred forty-seven".