28020777 has 16 divisors (see below), whose sum is σ = 40211712. Its totient is φ = 17291520.

The previous prime is 28020749. The next prime is 28020793. The reversal of 28020777 is 77702082.

It is a happy number.

It is not a de Polignac number, because 28020777 - 2¹¹ = 28018729 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28020077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1393 + ... + 7614.

It is an arithmetic number, because the mean of its divisors is an integer number (2513232).

Almost surely, 2^28020777 is an apocalyptic number.

It is an amenable number.

28020777 is a deficient number, since it is larger than the sum of its proper divisors (12190935).

28020777 is a wasteful number, since it uses less digits than its factorization.

28020777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9088.

The product of its (nonzero) digits is 10976, while the sum is 33.

The square root of 28020777 is about 5293.4655000293. The cubic root of 28020777 is about 303.7339871997.

The spelling of 28020777 in words is "twenty-eight million, twenty thousand, seven hundred seventy-seven".