999877435620 has 192 divisors, whose sum is σ = 3258950768640. Its totient is φ = 224316813312.

The previous prime is 999877435603. The next prime is 999877435621. The reversal of 999877435620 is 26534778999.

999877435620 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (69) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (999877435621) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 15902164 + ... + 15964916.

It is an arithmetic number, because the mean of its divisors is an integer number (16973701920).

Almost surely, 2^999877435620 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 999877435620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1629475384320).

999877435620 is an abundant number, since it is smaller than the sum of its proper divisors (2259073333020).

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

999877435620 is a wasteful number, since it uses less digits than its factorization.

999877435620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63474 (or 63472 counting only the distinct ones).

The product of its (nonzero) digits is 205752960, while the sum is 69.

The spelling of 999877435620 in words is "nine hundred ninety-nine billion, eight hundred seventy-seven million, four hundred thirty-five thousand, six hundred twenty".