28765011 has 16 divisors (see below), whose sum is σ = 42432768. Its totient is φ = 17186400.

The previous prime is 28765007. The next prime is 28765027. The reversal of 28765011 is 11056782.

It is not a de Polignac number, because 28765011 - 2² = 28765007 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28765011.

It is not an unprimeable number, because it can be changed into a prime (28765001) 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, 3796 + ... + 8481.

It is an arithmetic number, because the mean of its divisors is an integer number (2652048).

Almost surely, 2^28765011 is an apocalyptic number.

28765011 is a deficient number, since it is larger than the sum of its proper divisors (13667757).

28765011 is a wasteful number, since it uses less digits than its factorization.

28765011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12362.

The product of its (nonzero) digits is 3360, while the sum is 30.

The square root of 28765011 is about 5363.3022476829. The cubic root of 28765011 is about 306.3995911697.

It can be divided in two parts, 287650 and 11, that added together give a triangular number (287661 = T₇₅₈).

The spelling of 28765011 in words is "twenty-eight million, seven hundred sixty-five thousand, eleven".