90270728 has 32 divisors (see below), whose sum is σ = 173660760. Its totient is φ = 43975680.

The previous prime is 90270727. The next prime is 90270737. The reversal of 90270728 is 82707209.

It can be written as a sum of positive squares in 4 ways, for example, as 5299204 + 84971524 = 2302^2 + 9218^2 .

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (90270721) 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, 54326 + ... + 55962.

Almost surely, 2^90270728 is an apocalyptic number.

It is an amenable number.

90270728 is a deficient number, since it is larger than the sum of its proper divisors (83390032).

90270728 is a wasteful number, since it uses less digits than its factorization.

90270728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1817 (or 1813 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 35.

The square root of 90270728 is about 9501.0908847353. The cubic root of 90270728 is about 448.5893736410.

The spelling of 90270728 in words is "ninety million, two hundred seventy thousand, seven hundred twenty-eight".