28764771 has 16 divisors (see below), whose sum is σ = 43907328. Its totient is φ = 16408800.

The previous prime is 28764767. The next prime is 28764779. The reversal of 28764771 is 17746782.

It is not a de Polignac number, because 28764771 - 2² = 28764767 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28764779) 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, 21636 + ... + 22926.

It is an arithmetic number, because the mean of its divisors is an integer number (2744208).

Almost surely, 2^28764771 is an apocalyptic number.

28764771 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28764771 is a deficient number, since it is larger than the sum of its proper divisors (15142557).

28764771 is a wasteful number, since it uses less digits than its factorization.

28764771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2362.

The product of its digits is 131712, while the sum is 42.

The square root of 28764771 is about 5363.2798733611. The cubic root of 28764771 is about 306.3987390220.

The spelling of 28764771 in words is "twenty-eight million, seven hundred sixty-four thousand, seven hundred seventy-one".