61891104 has 192 divisors, whose sum is σ = 191600640. Its totient is φ = 17310720.

The previous prime is 61891103. The next prime is 61891129. The reversal of 61891104 is 40119816.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61891103) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1316809 + ... + 1316855.

It is an arithmetic number, because the mean of its divisors is an integer number (997920).

Almost surely, 2^61891104 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61891104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95800320).

61891104 is an abundant number, since it is smaller than the sum of its proper divisors (129709536).

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

61891104 is a wasteful number, since it uses less digits than its factorization.

61891104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143 (or 135 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 30.

The square root of 61891104 is about 7867.0899321159. The cubic root of 61891104 is about 395.5573055139.

The spelling of 61891104 in words is "sixty-one million, eight hundred ninety-one thousand, one hundred four".