90618669 has 10 divisors (see below), whose sum is σ = 135368750. Its totient is φ = 60412392.

The previous prime is 90618667. The next prime is 90618677. The reversal of 90618669 is 96681609.

It can be written as a sum of positive squares in only one way, i.e., 86769225 + 3849444 = 9315^2 + 1962^2 .

It is not a de Polignac number, because 90618669 - 2¹ = 90618667 is a prime.

It is a super-2 number, since 2×90618669² = 16423486342663122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90618667) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 559294 + ... + 559455.

It is an arithmetic number, because the mean of its divisors is an integer number (13536875).

Almost surely, 2^90618669 is an apocalyptic number.

It is an amenable number.

90618669 is a deficient number, since it is larger than the sum of its proper divisors (44750081).

90618669 is a wasteful number, since it uses less digits than its factorization.

90618669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1118761 (or 1118752 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 90618669 is about 9519.3838561117. The cubic root of 90618669 is about 449.1649848466.

The spelling of 90618669 in words is "ninety million, six hundred eighteen thousand, six hundred sixty-nine".