90999955 has 8 divisors (see below), whose sum is σ = 110516112. Its totient is φ = 71922528.

The previous prime is 90999947. The next prime is 90999959. The reversal of 90999955 is 55999909.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 90999955 - 2³ = 90999947 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 90999896 and 90999905.

It is not an unprimeable number, because it can be changed into a prime (90999959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109224 + ... + 110053.

It is an arithmetic number, because the mean of its divisors is an integer number (13814514).

Almost surely, 2^90999955 is an apocalyptic number.

90999955 is a deficient number, since it is larger than the sum of its proper divisors (19516157).

90999955 is a wasteful number, since it uses less digits than its factorization.

90999955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219365.

The product of its (nonzero) digits is 1476225, while the sum is 55.

The square root of 90999955 is about 9539.3896555283. The cubic root of 90999955 is about 449.7940703856.

The spelling of 90999955 in words is "ninety million, nine hundred ninety-nine thousand, nine hundred fifty-five".