28728777 has 16 divisors (see below), whose sum is σ = 47757312. Its totient is φ = 14923920.

The previous prime is 28728769. The next prime is 28728787. The reversal of 28728777 is 77782782.

It is not a de Polignac number, because 28728777 - 2³ = 28728769 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28728727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61953 + ... + 62414.

It is an arithmetic number, because the mean of its divisors is an integer number (2984832).

Almost surely, 2^28728777 is an apocalyptic number.

It is an amenable number.

28728777 is a deficient number, since it is larger than the sum of its proper divisors (19028535).

28728777 is a wasteful number, since it uses less digits than its factorization.

28728777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124388.

The product of its digits is 614656, while the sum is 48.

The square root of 28728777 is about 5359.9232270621. The cubic root of 28728777 is about 306.2708844844.

The spelling of 28728777 in words is "twenty-eight million, seven hundred twenty-eight thousand, seven hundred seventy-seven".