61879139808 has 192 divisors, whose sum is σ = 178493575680. Its totient is φ = 18699724800.

The previous prime is 61879139807. The next prime is 61879139831. The reversal of 61879139808 is 80893197816.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61879139807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4109253 + ... + 4124283.

It is an arithmetic number, because the mean of its divisors is an integer number (929654040).

Almost surely, 2^61879139808 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 61879139808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89246787840).

61879139808 is an abundant number, since it is smaller than the sum of its proper divisors (116614435872).

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

61879139808 is a wasteful number, since it uses less digits than its factorization.

61879139808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15161 (or 15153 counting only the distinct ones).

The product of its (nonzero) digits is 5225472, while the sum is 60.

The spelling of 61879139808 in words is "sixty-one billion, eight hundred seventy-nine million, one hundred thirty-nine thousand, eight hundred eight".