61650839 has 16 divisors (see below), whose sum is σ = 68796000. Its totient is φ = 54996480.

The previous prime is 61650829. The next prime is 61650881. The reversal of 61650839 is 93805616.

It is a cyclic number.

It is not a de Polignac number, because 61650839 - 2⁸ = 61650583 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61650829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21227 + ... + 23955.

It is an arithmetic number, because the mean of its divisors is an integer number (4299750).

Almost surely, 2^61650839 is an apocalyptic number.

61650839 is a deficient number, since it is larger than the sum of its proper divisors (7145161).

61650839 is a wasteful number, since it uses less digits than its factorization.

61650839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2818.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 61650839 is about 7851.8048243700. The cubic root of 61650839 is about 395.0447826169.

The spelling of 61650839 in words is "sixty-one million, six hundred fifty thousand, eight hundred thirty-nine".