90230728 has 32 divisors (see below), whose sum is σ = 194356800. Its totient is φ = 38469312.

The previous prime is 90230671. The next prime is 90230731. The reversal of 90230728 is 82703209.

It is a self number, because there is not a number n which added to its sum of digits gives 90230728.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6943 + ... + 15121.

It is an arithmetic number, because the mean of its divisors is an integer number (6073650).

Almost surely, 2^90230728 is an apocalyptic number.

It is an amenable number.

90230728 is an abundant number, since it is smaller than the sum of its proper divisors (104126072).

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

90230728 is a wasteful number, since it uses less digits than its factorization.

90230728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8389 (or 8385 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 90230728 is about 9498.9856300555. The cubic root of 90230728 is about 448.5231054780.

The spelling of 90230728 in words is "ninety million, two hundred thirty thousand, seven hundred twenty-eight".