90309955 has 4 divisors (see below), whose sum is σ = 108371952. Its totient is φ = 72247960.

The previous prime is 90309953. The next prime is 90310009. The reversal of 90309955 is 55990309.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 90309955 - 2¹ = 90309953 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90309953) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9030991 + ... + 9031000.

It is an arithmetic number, because the mean of its divisors is an integer number (27092988).

Almost surely, 2^90309955 is an apocalyptic number.

90309955 is a deficient number, since it is larger than the sum of its proper divisors (18061997).

90309955 is a wasteful number, since it uses less digits than its factorization.

90309955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18061996.

The product of its (nonzero) digits is 54675, while the sum is 40.

The square root of 90309955 is about 9503.1550024189. The cubic root of 90309955 is about 448.6543421620.

The spelling of 90309955 in words is "ninety million, three hundred nine thousand, nine hundred fifty-five".