90685669 has 4 divisors (see below), whose sum is σ = 90707500. Its totient is φ = 90663840.

The previous prime is 90685663. The next prime is 90685691. The reversal of 90685669 is 96658609.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 96658609 = 1621 ⋅59629.

It can be written as a sum of positive squares in 2 ways, for example, as 41152225 + 49533444 = 6415^2 + 7038^2 .

It is a cyclic number.

It is not a de Polignac number, because 90685669 - 2⁷ = 90685541 is a prime.

It is a super-2 number, since 2×90685669² = 16447781123955122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90685663) 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, 2544 + ... + 13705.

It is an arithmetic number, because the mean of its divisors is an integer number (22676875).

Almost surely, 2^90685669 is an apocalyptic number.

It is an amenable number.

90685669 is a deficient number, since it is larger than the sum of its proper divisors (21831).

90685669 is a wasteful number, since it uses less digits than its factorization.

90685669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21830.

The product of its (nonzero) digits is 699840, while the sum is 49.

The square root of 90685669 is about 9522.9023411983. The cubic root of 90685669 is about 449.2756560823.

The spelling of 90685669 in words is "ninety million, six hundred eighty-five thousand, six hundred sixty-nine".