90128532 has 48 divisors (see below), whose sum is σ = 233795072. Its totient is φ = 26835840.

The previous prime is 90128531. The next prime is 90128539. The reversal of 90128532 is 23582109.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 90128532.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90128531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4483 + ... + 14154.

Almost surely, 2^90128532 is an apocalyptic number.

It is an amenable number.

90128532 is an abundant number, since it is smaller than the sum of its proper divisors (143666540).

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

90128532 is a wasteful number, since it uses less digits than its factorization.

90128532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18688 (or 18686 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 90128532 is about 9493.6047948079. The cubic root of 90128532 is about 448.3537079627.

The spelling of 90128532 in words is "ninety million, one hundred twenty-eight thousand, five hundred thirty-two".