90450205 has 4 divisors (see below), whose sum is σ = 108540252. Its totient is φ = 72360160.

The previous prime is 90450197. The next prime is 90450211. The reversal of 90450205 is 50205409.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50205409 = 29 ⋅1731221.

It can be written as a sum of positive squares in 2 ways, for example, as 11115556 + 79334649 = 3334^2 + 8907^2 .

It is not a de Polignac number, because 90450205 - 2³ = 90450197 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 90450205.

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, 9045016 + ... + 9045025.

It is an arithmetic number, because the mean of its divisors is an integer number (27135063).

Almost surely, 2^90450205 is an apocalyptic number.

It is an amenable number.

90450205 is a deficient number, since it is larger than the sum of its proper divisors (18090047).

90450205 is a wasteful number, since it uses less digits than its factorization.

90450205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18090046.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 90450205 is about 9510.5312680207. The cubic root of 90450205 is about 448.8864731836.

The spelling of 90450205 in words is "ninety million, four hundred fifty thousand, two hundred five".