28811790 has 192 divisors, whose sum is σ = 94348800. Its totient is φ = 5951232.

The previous prime is 28811779. The next prime is 28811831. The reversal of 28811790 is 9711882.

It is a Curzon number.

It is a congruent number.

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 95 ways as a sum of consecutive naturals, for example, 347089 + ... + 347171.

It is an arithmetic number, because the mean of its divisors is an integer number (491400).

Almost surely, 2^28811790 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28811790, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47174400).

28811790 is an abundant number, since it is smaller than the sum of its proper divisors (65537010).

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

28811790 is a wasteful number, since it uses less digits than its factorization.

28811790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151 (or 148 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 36.

The square root of 28811790 is about 5367.6615019951. The cubic root of 28811790 is about 306.5655949742.

The spelling of 28811790 in words is "twenty-eight million, eight hundred eleven thousand, seven hundred ninety".