61909845 has 16 divisors (see below), whose sum is σ = 99667392. Its totient is φ = 32814720.

The previous prime is 61909829. The next prime is 61909853. The reversal of 61909845 is 54890916.

It is not a de Polignac number, because 61909845 - 2⁴ = 61909829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61909797 and 61909806.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10216 + ... + 15105.

It is an arithmetic number, because the mean of its divisors is an integer number (6229212).

Almost surely, 2^61909845 is an apocalyptic number.

It is an amenable number.

61909845 is a deficient number, since it is larger than the sum of its proper divisors (37757547).

61909845 is a wasteful number, since it uses less digits than its factorization.

61909845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25492.

The product of its (nonzero) digits is 77760, while the sum is 42.

The square root of 61909845 is about 7868.2809431286. The cubic root of 61909845 is about 395.5972271982.

The spelling of 61909845 in words is "sixty-one million, nine hundred nine thousand, eight hundred forty-five".