99985520 has 20 divisors (see below), whose sum is σ = 232466520. Its totient is φ = 39994176.

The previous prime is 99985489. The next prime is 99985547. The reversal of 99985520 is 2558999.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is a nialpdrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 624830 + ... + 624989.

It is an arithmetic number, because the mean of its divisors is an integer number (11623326).

Almost surely, 2^99985520 is an apocalyptic number.

It is an amenable number.

99985520 is an abundant number, since it is smaller than the sum of its proper divisors (132481000).

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

99985520 is a wasteful number, since it uses less digits than its factorization.

99985520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1249832 (or 1249826 counting only the distinct ones).

The product of its (nonzero) digits is 291600, while the sum is 47.

The square root of 99985520 is about 9999.2759737893. The cubic root of 99985520 is about 464.1364788777.

The spelling of 99985520 in words is "ninety-nine million, nine hundred eighty-five thousand, five hundred twenty".