90364821 has 4 divisors (see below), whose sum is σ = 120486432. Its totient is φ = 60243212.

The previous prime is 90364819. The next prime is 90364829. The reversal of 90364821 is 12846309.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 90364821 - 2¹ = 90364819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90364829) 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, 15060801 + ... + 15060806.

It is an arithmetic number, because the mean of its divisors is an integer number (30121608).

Almost surely, 2^90364821 is an apocalyptic number.

It is an amenable number.

90364821 is a deficient number, since it is larger than the sum of its proper divisors (30121611).

90364821 is a wasteful number, since it uses less digits than its factorization.

90364821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30121610.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 90364821 is about 9506.0412896221. The cubic root of 90364821 is about 448.7451807481.

The spelling of 90364821 in words is "ninety million, three hundred sixty-four thousand, eight hundred twenty-one".