90488021 has 8 divisors (see below), whose sum is σ = 98414904. Its totient is φ = 82699200.

The previous prime is 90488017. The next prime is 90488023. The reversal of 90488021 is 12088409.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 14554225 + 75933796 = 3815^2 + 8714^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 90488021 - 2² = 90488017 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 (90488023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33146 + ... + 35771.

It is an arithmetic number, because the mean of its divisors is an integer number (12301863).

Almost surely, 2^90488021 is an apocalyptic number.

It is an amenable number.

90488021 is a deficient number, since it is larger than the sum of its proper divisors (7926883).

90488021 is a wasteful number, since it uses less digits than its factorization.

90488021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69031.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 90488021 is about 9512.5191721226. The cubic root of 90488021 is about 448.9490222430.

The spelling of 90488021 in words is "ninety million, four hundred eighty-eight thousand, twenty-one".