90669021 has 16 divisors (see below), whose sum is σ = 122193408. Its totient is φ = 59799600.

The previous prime is 90669001. The next prime is 90669031. The reversal of 90669021 is 12096609.

It is a happy number.

It is not a de Polignac number, because 90669021 - 2⁶ = 90668957 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90669001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 143376 + ... + 144006.

It is an arithmetic number, because the mean of its divisors is an integer number (7637088).

Almost surely, 2^90669021 is an apocalyptic number.

It is an amenable number.

90669021 is a deficient number, since it is larger than the sum of its proper divisors (31524387).

90669021 is a wasteful number, since it uses less digits than its factorization.

90669021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1072.

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 90669021 is about 9522.0281978158. The cubic root of 90669021 is about 449.2481618488.

The spelling of 90669021 in words is "ninety million, six hundred sixty-nine thousand, twenty-one".