90758821 has 4 divisors (see below), whose sum is σ = 90798444. Its totient is φ = 90719200.

The previous prime is 90758809. The next prime is 90758827. The reversal of 90758821 is 12885709.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17313921 + 73444900 = 4161^2 + 8570^2 .

It is a cyclic number.

It is not a de Polignac number, because 90758821 - 2⁷ = 90758693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90758827) 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, 16150 + ... + 21031.

It is an arithmetic number, because the mean of its divisors is an integer number (22699611).

Almost surely, 2^90758821 is an apocalyptic number.

It is an amenable number.

90758821 is a deficient number, since it is larger than the sum of its proper divisors (39623).

90758821 is a wasteful number, since it uses less digits than its factorization.

90758821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39622.

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 90758821 is about 9526.7424128083. The cubic root of 90758821 is about 449.3964270196.

The spelling of 90758821 in words is "ninety million, seven hundred fifty-eight thousand, eight hundred twenty-one".