99491868 has 96 divisors (see below), whose sum is σ = 297937920. Its totient is φ = 28123200.

The previous prime is 99491857. The next prime is 99491879. The reversal of 99491868 is 86819499.

99491868 is a `hidden beast` number, since 99 + 491 + 8 + 68 = 666.

It is an interprime number because it is at equal distance from previous prime (99491857) and next prime (99491879).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 75705 + ... + 77007.

It is an arithmetic number, because the mean of its divisors is an integer number (3103520).

Almost surely, 2^99491868 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 99491868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (148968960).

99491868 is an abundant number, since it is smaller than the sum of its proper divisors (198446052).

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

99491868 is a wasteful number, since it uses less digits than its factorization.

99491868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1424 (or 1416 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 54.

The square root of 99491868 is about 9974.5610429733. The cubic root of 99491868 is about 463.3713680397.

The spelling of 99491868 in words is "ninety-nine million, four hundred ninety-one thousand, eight hundred sixty-eight".