61775868 has 72 divisors (see below), whose sum is σ = 182939904. Its totient is φ = 16044000.

The previous prime is 61775849. The next prime is 61775873. The reversal of 61775868 is 86857716.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1693 + ... + 11243.

It is an arithmetic number, because the mean of its divisors is an integer number (2540832).

Almost surely, 2^61775868 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 61775868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91469952).

61775868 is an abundant number, since it is smaller than the sum of its proper divisors (121164036).

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

61775868 is a wasteful number, since it uses less digits than its factorization.

61775868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9583 (or 9574 counting only the distinct ones).

The product of its digits is 564480, while the sum is 48.

The square root of 61775868 is about 7859.7625918344. The cubic root of 61775868 is about 395.3116549103.

The spelling of 61775868 in words is "sixty-one million, seven hundred seventy-five thousand, eight hundred sixty-eight".