61663239 has 12 divisors (see below), whose sum is σ = 97166472. Its totient is φ = 37371600.

The previous prime is 61663237. The next prime is 61663279. The reversal of 61663239 is 93236616.

61663239 is a `hidden beast` number, since 6 + 16 + 632 + 3 + 9 = 666.

61663239 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 61663239 - 2¹ = 61663237 is a prime.

It is a super-2 number, since 2×61663239² = 7604710087942242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61663237) 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 11 ways as a sum of consecutive naturals, for example, 311332 + ... + 311529.

It is an arithmetic number, because the mean of its divisors is an integer number (8097206).

Almost surely, 2^61663239 is an apocalyptic number.

61663239 is a deficient number, since it is larger than the sum of its proper divisors (35503233).

61663239 is a wasteful number, since it uses less digits than its factorization.

61663239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 622878 (or 622875 counting only the distinct ones).

The product of its digits is 34992, while the sum is 36.

The square root of 61663239 is about 7852.5944120399. The cubic root of 61663239 is about 395.0712663166.

The spelling of 61663239 in words is "sixty-one million, six hundred sixty-three thousand, two hundred thirty-nine".