61647945 has 32 divisors (see below), whose sum is σ = 100552320. Its totient is φ = 32248320.

The previous prime is 61647931. The next prime is 61647947. The reversal of 61647945 is 54974616.

61647945 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 61647945 - 2⁸ = 61647689 is a prime.

It is a super-3 number, since 3×61647945³ (a number of 24 digits) contains 333 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 61647897 and 61647906.

It is not an unprimeable number, because it can be changed into a prime (61647947) 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 31 ways as a sum of consecutive naturals, for example, 269091 + ... + 269319.

It is an arithmetic number, because the mean of its divisors is an integer number (3142260).

Almost surely, 2^61647945 is an apocalyptic number.

It is an amenable number.

61647945 is a deficient number, since it is larger than the sum of its proper divisors (38904375).

61647945 is a wasteful number, since it uses less digits than its factorization.

61647945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505.

The product of its digits is 181440, while the sum is 42.

The square root of 61647945 is about 7851.6205333676. The cubic root of 61647945 is about 395.0386011520.

The spelling of 61647945 in words is "sixty-one million, six hundred forty-seven thousand, nine hundred forty-five".