90450905 has 4 divisors (see below), whose sum is σ = 108541092. Its totient is φ = 72360720.

The previous prime is 90450859. The next prime is 90450907. The reversal of 90450905 is 50905409.

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

It can be written as a sum of positive squares in 2 ways, for example, as 30558784 + 59892121 = 5528^2 + 7739^2 .

It is not a de Polignac number, because 90450905 - 2¹⁴ = 90434521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90450907) 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, 9045086 + ... + 9045095.

It is an arithmetic number, because the mean of its divisors is an integer number (27135273).

Almost surely, 2^90450905 is an apocalyptic number.

It is an amenable number.

90450905 is a deficient number, since it is larger than the sum of its proper divisors (18090187).

90450905 is a wasteful number, since it uses less digits than its factorization.

90450905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18090186.

The product of its (nonzero) digits is 8100, while the sum is 32.

The square root of 90450905 is about 9510.5680692585. The cubic root of 90450905 is about 448.8876311678.

The spelling of 90450905 in words is "ninety million, four hundred fifty thousand, nine hundred five".