999999461107878 has 512 divisors, whose sum is σ = 2584275989299200. Its totient is φ = 250485249830400.

The previous prime is 999999461107769. The next prime is 999999461107883. The reversal of 999999461107878 is 878701164999999.

999999461107878 is a nontrivial binomial coefficient, being equal to C(44721348, 2).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 674308469325 + ... + 674308470807.

It is an arithmetic number, because the mean of its divisors is an integer number (5047414041600).

Almost surely, 2^{999999461107878} is an apocalyptic number.

999999461107878 is the 44721347-th triangular number and also the 22360674-th hexagonal number.

It is a practical number, because each smaller number is the sum of distinct divisors of 999999461107878, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1292137994649600).

999999461107878 is an abundant number, since it is smaller than the sum of its proper divisors (1584276528191322).

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

999999461107878 is a wasteful number, since it uses less digits than its factorization.

999999461107878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2968.

The product of its (nonzero) digits is 39998375424, while the sum is 96.

The spelling of 999999461107878 in words is "nine hundred ninety-nine trillion, nine hundred ninety-nine billion, four hundred sixty-one million, one hundred seven thousand, eight hundred seventy-eight".