61971868 has 48 divisors (see below), whose sum is σ = 133963200. Its totient is φ = 24987648.

The previous prime is 61971829. The next prime is 61971881. The reversal of 61971868 is 86817916.

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, 21996 + ... + 24652.

It is an arithmetic number, because the mean of its divisors is an integer number (2790900).

Almost surely, 2^61971868 is an apocalyptic number.

61971868 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61971868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66981600).

61971868 is an abundant number, since it is smaller than the sum of its proper divisors (71991332).

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

61971868 is a wasteful number, since it uses less digits than its factorization.

61971868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2699 (or 2683 counting only the distinct ones).

The product of its digits is 145152, while the sum is 46.

The square root of 61971868 is about 7872.2212875401. The cubic root of 61971868 is about 395.7292898651.

The spelling of 61971868 in words is "sixty-one million, nine hundred seventy-one thousand, eight hundred sixty-eight".