90442045 has 4 divisors (see below), whose sum is σ = 108530460. Its totient is φ = 72353632.

The previous prime is 90442043. The next prime is 90442063. The reversal of 90442045 is 54024409.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54024409 = 599 ⋅90191.

It can be written as a sum of positive squares in 2 ways, for example, as 72012196 + 18429849 = 8486^2 + 4293^2 .

It is a cyclic number.

It is not a de Polignac number, because 90442045 - 2¹ = 90442043 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90442043) 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, 9044200 + ... + 9044209.

It is an arithmetic number, because the mean of its divisors is an integer number (27132615).

Almost surely, 2^90442045 is an apocalyptic number.

It is an amenable number.

90442045 is a deficient number, since it is larger than the sum of its proper divisors (18088415).

90442045 is a wasteful number, since it uses less digits than its factorization.

90442045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18088414.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 90442045 is about 9510.1022602283. The cubic root of 90442045 is about 448.8729739558.

The spelling of 90442045 in words is "ninety million, four hundred forty-two thousand, forty-five".