90404028 has 144 divisors (see below), whose sum is σ = 284540256. Its totient is φ = 23777280.

The previous prime is 90404023. The next prime is 90404047. The reversal of 90404028 is 82040409.

It is a junction number, because it is equal to n+sod(n) for n = 90403992 and 90404010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90404021) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 87000 + ... + 88032.

It is an arithmetic number, because the mean of its divisors is an integer number (1975974).

Almost surely, 2^90404028 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 90404028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (142270128).

90404028 is an abundant number, since it is smaller than the sum of its proper divisors (194136228).

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

90404028 is a wasteful number, since it uses less digits than its factorization.

90404028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1084 (or 1079 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 90404028 is about 9508.1032808863. The cubic root of 90404028 is about 448.8100710753.

The spelling of 90404028 in words is "ninety million, four hundred four thousand, twenty-eight".