90669709 has 8 divisors (see below), whose sum is σ = 97893432. Its totient is φ = 83481600.

The previous prime is 90669673. The next prime is 90669727. The reversal of 90669709 is 90796609.

It can be written as a sum of positive squares in 4 ways, for example, as 13176900 + 77492809 = 3630^2 + 8803^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 90669709 - 2¹³ = 90661517 is a prime.

It is a super-2 number, since 2×90669709² = 16441992260289362, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90669739) 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 7 ways as a sum of consecutive naturals, for example, 3484 + ... + 13909.

It is an arithmetic number, because the mean of its divisors is an integer number (12236679).

Almost surely, 2^90669709 is an apocalyptic number.

It is an amenable number.

90669709 is a deficient number, since it is larger than the sum of its proper divisors (7223723).

90669709 is a wasteful number, since it uses less digits than its factorization.

90669709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17807.

The product of its (nonzero) digits is 183708, while the sum is 46.

The square root of 90669709 is about 9522.0643245044. The cubic root of 90669709 is about 449.2492981500.

It can be divided in two parts, 90669 and 709, that added together give a triangular number (91378 = T₄₂₇).

The spelling of 90669709 in words is "ninety million, six hundred sixty-nine thousand, seven hundred nine".