61909218 has 32 divisors (see below), whose sum is σ = 157230720. Its totient is φ = 17688240.

The previous prime is 61909217. The next prime is 61909241. The reversal of 61909218 is 81290916.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61909217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81513 + ... + 82268.

It is an arithmetic number, because the mean of its divisors is an integer number (4913460).

Almost surely, 2^61909218 is an apocalyptic number.

61909218 is an abundant number, since it is smaller than the sum of its proper divisors (95321502).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61909218 is a wasteful number, since it uses less digits than its factorization.

61909218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163799 (or 163793 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 36.

The square root of 61909218 is about 7868.2410995088. The cubic root of 61909218 is about 395.5958917062.

The spelling of 61909218 in words is "sixty-one million, nine hundred nine thousand, two hundred eighteen".