90454545 has 24 divisors (see below), whose sum is σ = 157076712. Its totient is φ = 48153600.

The previous prime is 90454543. The next prime is 90454547. The reversal of 90454545 is 54545409.

It is an interprime number because it is at equal distance from previous prime (90454543) and next prime (90454547).

It can be written as a sum of positive squares in 4 ways, for example, as 46457856 + 43996689 = 6816^2 + 6633^2 .

It is not a de Polignac number, because 90454545 - 2¹ = 90454543 is a prime.

It is a super-2 number, since 2×90454545² = 16364049422314050, which contains 22 as substring.

90454545 is a modest number, since divided by 454545 gives 90 as remainder.

It is not an unprimeable number, because it can be changed into a prime (90454541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28225 + ... + 31265.

It is an arithmetic number, because the mean of its divisors is an integer number (6544863).

Almost surely, 2^90454545 is an apocalyptic number.

It is an amenable number.

90454545 is a deficient number, since it is larger than the sum of its proper divisors (66622167).

90454545 is a wasteful number, since it uses less digits than its factorization.

90454545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3713 (or 3710 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

The square root of 90454545 is about 9510.7594333996. The cubic root of 90454545 is about 448.8936525893.

The spelling of 90454545 in words is "ninety million, four hundred fifty-four thousand, five hundred forty-five".