99870856 has 8 divisors (see below), whose sum is σ = 187257870. Its totient is φ = 49935424.

The previous prime is 99870833. The next prime is 99870857. The reversal of 99870856 is 65807899.

It can be written as a sum of positive squares in only one way, i.e., 99800100 + 70756 = 9990^2 + 266^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (99870857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6241921 + ... + 6241936.

Almost surely, 2^99870856 is an apocalyptic number.

It is an amenable number.

99870856 is a deficient number, since it is larger than the sum of its proper divisors (87387014).

99870856 is a wasteful number, since it uses less digits than its factorization.

99870856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12483863 (or 12483859 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 52.

The square root of 99870856 is about 9993.5407138811. The cubic root of 99870856 is about 463.9589861687.

The spelling of 99870856 in words is "ninety-nine million, eight hundred seventy thousand, eight hundred fifty-six".