90769821 has 16 divisors (see below), whose sum is σ = 128409600. Its totient is φ = 56872368.

The previous prime is 90769807. The next prime is 90769841. The reversal of 90769821 is 12896709.

It is not a de Polignac number, because 90769821 - 2⁹ = 90769309 is a prime.

It is a super-3 number, since 3×90769821³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90769841) 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 15 ways as a sum of consecutive naturals, for example, 970 + ... + 13508.

It is an arithmetic number, because the mean of its divisors is an integer number (8025600).

Almost surely, 2^90769821 is an apocalyptic number.

It is an amenable number.

90769821 is a deficient number, since it is larger than the sum of its proper divisors (37639779).

90769821 is a wasteful number, since it uses less digits than its factorization.

90769821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12688.

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 90769821 is about 9527.3197175281. The cubic root of 90769821 is about 449.4145819528.

The spelling of 90769821 in words is "ninety million, seven hundred sixty-nine thousand, eight hundred twenty-one".