99998550 has 60 divisors (see below), whose sum is σ = 277859076. Its totient is φ = 26665200.

The previous prime is 99998543. The next prime is 99998551. The reversal of 99998550 is 5589999.

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

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99998551) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 8296 + ... + 16395.

Almost surely, 2^99998550 is an apocalyptic number.

99998550 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

99998550 is an abundant number, since it is smaller than the sum of its proper divisors (177860526).

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

99998550 is a wasteful number, since it uses less digits than its factorization.

99998550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24715 (or 24701 counting only the distinct ones).

The product of its (nonzero) digits is 1312200, while the sum is 54.

The square root of 99998550 is about 9999.9274997372. The cubic root of 99998550 is about 464.1566399158.

The spelling of 99998550 in words is "ninety-nine million, nine hundred ninety-eight thousand, five hundred fifty".