61645339 has 8 divisors (see below), whose sum is σ = 70506720. Its totient is φ = 52797696.

The previous prime is 61645333. The next prime is 61645351. The reversal of 61645339 is 93354616.

61645339 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 de Polignac number, because none of the positive numbers 2^k-61645339 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61645298 and 61645307.

It is not an unprimeable number, because it can be changed into a prime (61645333) 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, 9387 + ... + 14539.

It is an arithmetic number, because the mean of its divisors is an integer number (8813340).

Almost surely, 2^61645339 is an apocalyptic number.

61645339 is a deficient number, since it is larger than the sum of its proper divisors (8861381).

61645339 is a wasteful number, since it uses less digits than its factorization.

61645339 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6869.

The product of its digits is 58320, while the sum is 37.

The square root of 61645339 is about 7851.4545786115. The cubic root of 61645339 is about 395.0330346777.

The spelling of 61645339 in words is "sixty-one million, six hundred forty-five thousand, three hundred thirty-nine".