61642905 has 16 divisors (see below), whose sum is σ = 100301760. Its totient is φ = 32318528.

The previous prime is 61642891. The next prime is 61642909. The reversal of 61642905 is 50924616.

61642905 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 61642905 - 2⁸ = 61642649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61642909) 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 15 ways as a sum of consecutive naturals, for example, 33942 + ... + 35711.

It is an arithmetic number, because the mean of its divisors is an integer number (6268860).

Almost surely, 2^61642905 is an apocalyptic number.

It is an amenable number.

61642905 is a deficient number, since it is larger than the sum of its proper divisors (38658855).

61642905 is a wasteful number, since it uses less digits than its factorization.

61642905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69720.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 61642905 is about 7851.2995739559. The cubic root of 61642905 is about 395.0278354576.

The spelling of 61642905 in words is "sixty-one million, six hundred forty-two thousand, nine hundred five".