90476021 has 4 divisors (see below), whose sum is σ = 90566700. Its totient is φ = 90385344.

The previous prime is 90476003. The next prime is 90476039. The reversal of 90476021 is 12067409.

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

It is an interprime number because it is at equal distance from previous prime (90476003) and next prime (90476039).

It can be written as a sum of positive squares in 2 ways, for example, as 26635921 + 63840100 = 5161^2 + 7990^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90476021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90476041) 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, 43826 + ... + 45843.

It is an arithmetic number, because the mean of its divisors is an integer number (22641675).

Almost surely, 2^90476021 is an apocalyptic number.

It is an amenable number.

90476021 is a deficient number, since it is larger than the sum of its proper divisors (90679).

90476021 is a wasteful number, since it uses less digits than its factorization.

90476021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90678.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 90476021 is about 9511.8884034665. Note that the first 3 decimals coincide. The cubic root of 90476021 is about 448.9291756881.

The spelling of 90476021 in words is "ninety million, four hundred seventy-six thousand, twenty-one".