61615906 has 16 divisors (see below), whose sum is σ = 101473920. Its totient is φ = 27827280.

The previous prime is 61615889. The next prime is 61615909. The reversal of 61615906 is 60951616.

61615906 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (61615909) 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, 5466 + ... + 12373.

It is an arithmetic number, because the mean of its divisors is an integer number (6342120).

Almost surely, 2^61615906 is an apocalyptic number.

61615906 is a deficient number, since it is larger than the sum of its proper divisors (39858014).

61615906 is a wasteful number, since it uses less digits than its factorization.

61615906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18009.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 61615906 is about 7849.5799887637. The cubic root of 61615906 is about 394.9701542370.

The spelling of 61615906 in words is "sixty-one million, six hundred fifteen thousand, nine hundred six".