28711769 has 8 divisors (see below), whose sum is σ = 29763720. Its totient is φ = 27664000.

The previous prime is 28711763. The next prime is 28711777. The reversal of 28711769 is 96711782.

It can be written as a sum of positive squares in 4 ways, for example, as 3108169 + 25603600 = 1763^2 + 5060^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28711769 - 2¹² = 28707673 is a prime.

It is a super-2 number, since 2×28711769² = 1648731358218722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28711763) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21419 + ... + 22719.

It is an arithmetic number, because the mean of its divisors is an integer number (3720465).

Almost surely, 2^28711769 is an apocalyptic number.

28711769 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

28711769 is a deficient number, since it is larger than the sum of its proper divisors (1051951).

28711769 is a wasteful number, since it uses less digits than its factorization.

28711769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2091.

The product of its digits is 42336, while the sum is 41.

The square root of 28711769 is about 5358.3364022801. The cubic root of 28711769 is about 306.2104330946.

The spelling of 28711769 in words is "twenty-eight million, seven hundred eleven thousand, seven hundred sixty-nine".