28111469 has 16 divisors (see below), whose sum is σ = 30897600. Its totient is φ = 25474176.

The previous prime is 28111463. The next prime is 28111487. The reversal of 28111469 is 96411182.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28111469 is a prime.

It is a super-2 number, since 2×28111469² = 1580509378675922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28111463) 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, 89657 + ... + 89969.

It is an arithmetic number, because the mean of its divisors is an integer number (1931100).

Almost surely, 2^28111469 is an apocalyptic number.

28111469 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

28111469 is a deficient number, since it is larger than the sum of its proper divisors (2786131).

28111469 is a wasteful number, since it uses less digits than its factorization.

28111469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 524.

The product of its digits is 3456, while the sum is 32.

The square root of 28111469 is about 5302.0249905107. The cubic root of 28111469 is about 304.0613226073.

The spelling of 28111469 in words is "twenty-eight million, one hundred eleven thousand, four hundred sixty-nine".