90549819 has 28 divisors (see below), whose sum is σ = 136616256. Its totient is φ = 59987952.

The previous prime is 90549817. The next prime is 90549829. The reversal of 90549819 is 91894509.

90549819 is a `hidden beast` number, since 90 + 549 + 8 + 19 = 666.

It is not a de Polignac number, because 90549819 - 2¹ = 90549817 is a prime.

It is a super-2 number, since 2×90549819² = 16398539441865522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (90549817) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 162289 + ... + 162845.

It is an arithmetic number, because the mean of its divisors is an integer number (4879152).

Almost surely, 2^90549819 is an apocalyptic number.

90549819 is a deficient number, since it is larger than the sum of its proper divisors (46066437).

90549819 is an equidigital number, since it uses as much as digits as its factorization.

90549819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 798 (or 783 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 45.

The square root of 90549819 is about 9515.7668634745. The cubic root of 90549819 is about 449.0512009178.

The spelling of 90549819 in words is "ninety million, five hundred forty-nine thousand, eight hundred nineteen".