99858861900 has 432 divisors, whose sum is σ = 379991678976. Its totient is φ = 21412362240.

The previous prime is 99858861863. The next prime is 99858861929. The reversal of 99858861900 is 916885899.

99858861900 is a `hidden beast` number, since 9 + 9 + 8 + 5 + 8 + 8 + 619 + 0 + 0 = 666.

It is a super-2 number, since 2×99858861900² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 37162357 + ... + 37165043.

It is an arithmetic number, because the mean of its divisors is an integer number (879610368).

Almost surely, 2^99858861900 is an apocalyptic number.

99858861900 is a gapful number since it is divisible by the number (90) 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 99858861900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (189995839488).

99858861900 is an abundant number, since it is smaller than the sum of its proper divisors (280132817076).

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

99858861900 is a wasteful number, since it uses less digits than its factorization.

99858861900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3078 (or 3068 counting only the distinct ones).

The product of its (nonzero) digits is 11197440, while the sum is 63.

The spelling of 99858861900 in words is "ninety-nine billion, eight hundred fifty-eight million, eight hundred sixty-one thousand, nine hundred".