61536643 has 8 divisors (see below), whose sum is σ = 72596480. Its totient is φ = 51044040.

The previous prime is 61536599. The next prime is 61536659. The reversal of 61536643 is 34663516.

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 61536643 - 2⁹ = 61536131 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61536599 and 61536608.

It is not an unprimeable number, because it can be changed into a prime (61536443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 141573 + ... + 142006.

It is an arithmetic number, because the mean of its divisors is an integer number (9074560).

Almost surely, 2^61536643 is an apocalyptic number.

61536643 is a deficient number, since it is larger than the sum of its proper divisors (11059837).

61536643 is a wasteful number, since it uses less digits than its factorization.

61536643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283617.

The product of its digits is 38880, while the sum is 34.

The square root of 61536643 is about 7844.5294951323. The cubic root of 61536643 is about 394.8007177215.

The spelling of 61536643 in words is "sixty-one million, five hundred thirty-six thousand, six hundred forty-three".