90669829 has 2 divisors, whose sum is σ = 90669830. Its totient is φ = 90669828.

The previous prime is 90669809. The next prime is 90669847. The reversal of 90669829 is 92896609.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 88792929 + 1876900 = 9423^2 + 1370^2 .

It is a cyclic number.

It is not a de Polignac number, because 90669829 - 2⁹ = 90669317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90669809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45334914 + 45334915.

It is an arithmetic number, because the mean of its divisors is an integer number (45334915).

Almost surely, 2^90669829 is an apocalyptic number.

It is an amenable number.

90669829 is a deficient number, since it is larger than the sum of its proper divisors (1).

90669829 is an equidigital number, since it uses as much as digits as its factorization.

90669829 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 419904, while the sum is 49.

The square root of 90669829 is about 9522.0706256570. The cubic root of 90669829 is about 449.2494963415.

The spelling of 90669829 in words is "ninety million, six hundred sixty-nine thousand, eight hundred twenty-nine".