90428549 has 4 divisors (see below), whose sum is σ = 90493260. Its totient is φ = 90363840.

The previous prime is 90428521. The next prime is 90428551. The reversal of 90428549 is 94582409.

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 9302500 + 81126049 = 3050^2 + 9007^2 .

It is a cyclic number.

It is not a de Polignac number, because 90428549 - 2²⁰ = 89379973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90428579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30212 + ... + 33069.

It is an arithmetic number, because the mean of its divisors is an integer number (22623315).

Almost surely, 2^90428549 is an apocalyptic number.

It is an amenable number.

90428549 is a deficient number, since it is larger than the sum of its proper divisors (64711).

90428549 is a wasteful number, since it uses less digits than its factorization.

90428549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64710.

The product of its (nonzero) digits is 103680, while the sum is 41.

The square root of 90428549 is about 9509.3926725107. The cubic root of 90428549 is about 448.8506455096.

The spelling of 90428549 in words is "ninety million, four hundred twenty-eight thousand, five hundred forty-nine".