99990055 has 16 divisors (see below), whose sum is σ = 131220000. Its totient is φ = 72540160.

The previous prime is 99990053. The next prime is 99990083. The reversal of 99990055 is 55009999.

It is not a de Polignac number, because 99990055 - 2¹ = 99990053 is a prime.

It is a super-2 number, since 2×99990055² = 19996022197806050, which contains 22 as substring.

It is a zygodrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 99989987 and 99990014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99990053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22671 + ... + 26719.

It is an arithmetic number, because the mean of its divisors is an integer number (8201250).

Almost surely, 2^99990055 is an apocalyptic number.

99990055 is a deficient number, since it is larger than the sum of its proper divisors (31229945).

99990055 is a wasteful number, since it uses less digits than its factorization.

99990055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4514.

The product of its (nonzero) digits is 164025, while the sum is 46.

The square root of 99990055 is about 9999.5027376365. The cubic root of 99990055 is about 464.1434959842.

The spelling of 99990055 in words is "ninety-nine million, nine hundred ninety thousand, fifty-five".