90020478 has 8 divisors (see below), whose sum is σ = 180040968. Its totient is φ = 30006824.

The previous prime is 90020477. The next prime is 90020479. The reversal of 90020478 is 87402009.

It is an interprime number because it is at equal distance from previous prime (90020477) and next prime (90020479).

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

90020478 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90020471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7501701 + ... + 7501712.

It is an arithmetic number, because the mean of its divisors is an integer number (22505121).

Almost surely, 2^90020478 is an apocalyptic number.

90020478 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

90020478 is a wasteful number, since it uses less digits than its factorization.

90020478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15003418.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 90020478 is about 9487.9122044842. The cubic root of 90020478 is about 448.1744610435.

The spelling of 90020478 in words is "ninety million, twenty thousand, four hundred seventy-eight".