61647 has 4 divisors (see below), whose sum is σ = 82200. Its totient is φ = 41096.

The previous prime is 61643. The next prime is 61651. The reversal of 61647 is 74616.

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

It is an interprime number because it is at equal distance from previous prime (61643) and next prime (61651).

It is a cyclic number.

It is not a de Polignac number, because 61647 - 2² = 61643 is a prime.

It is a D-number.

It is a zygodrome in base 2.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 61647.

It is not an unprimeable number, because it can be changed into a prime (61643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10272 + ... + 10277.

It is an arithmetic number, because the mean of its divisors is an integer number (20550).

2⁶¹⁶⁴⁷ is an apocalyptic number.

61647 is a deficient number, since it is larger than the sum of its proper divisors (20553).

61647 is a wasteful number, since it uses less digits than its factorization.

61647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20552.

The product of its digits is 1008, while the sum is 24.

The square root of 61647 is about 248.2881390643. The cubic root of 61647 is about 39.5036582629.

It can be divided in two parts, 6 and 1647, that added together give a triangular number (1653 = T₅₇).

The spelling of 61647 in words is "sixty-one thousand, six hundred forty-seven".