90028811 has 4 divisors (see below), whose sum is σ = 90106224. Its totient is φ = 89951400.

The previous prime is 90028801. The next prime is 90028817. The reversal of 90028811 is 11882009.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11882009 = 947 ⋅12547.

It is a cyclic number.

It is not a de Polignac number, because 90028811 - 2¹⁴ = 90012427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90028817) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36935 + ... + 39296.

It is an arithmetic number, because the mean of its divisors is an integer number (22526556).

Almost surely, 2^90028811 is an apocalyptic number.

90028811 is a deficient number, since it is larger than the sum of its proper divisors (77413).

90028811 is a wasteful number, since it uses less digits than its factorization.

90028811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77412.

The product of its (nonzero) digits is 1152, while the sum is 29.

The square root of 90028811 is about 9488.3513320281. The cubic root of 90028811 is about 448.1882894621.

The spelling of 90028811 in words is "ninety million, twenty-eight thousand, eight hundred eleven".