616129878 has 128 divisors (see below), whose sum is σ = 1646023680. Its totient is φ = 149114880.

The previous prime is 616129799. The next prime is 616129889. The reversal of 616129878 is 878921616.

616129878 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 379753 + ... + 381371.

It is an arithmetic number, because the mean of its divisors is an integer number (12859560).

Almost surely, 2^616129878 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 616129878, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (823011840).

616129878 is an abundant number, since it is smaller than the sum of its proper divisors (1029893802).

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

616129878 is a wasteful number, since it uses less digits than its factorization.

616129878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1702.

The product of its digits is 290304, while the sum is 48.

The square root of 616129878 is about 24821.9636209547. The cubic root of 616129878 is about 850.9239678127.

The spelling of 616129878 in words is "six hundred sixteen million, one hundred twenty-nine thousand, eight hundred seventy-eight".