28726469 has 4 divisors (see below), whose sum is σ = 28770720. Its totient is φ = 28682220.

The previous prime is 28726463. The next prime is 28726487. The reversal of 28726469 is 96462782.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28726469 - 2¹² = 28722373 is a prime.

It is a super-2 number, since 2×28726469² = 1650420042415922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28726463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21137 + ... + 22454.

It is an arithmetic number, because the mean of its divisors is an integer number (7192680).

Almost surely, 2^28726469 is an apocalyptic number.

It is an amenable number.

28726469 is a deficient number, since it is larger than the sum of its proper divisors (44251).

28726469 is an equidigital number, since it uses as much as digits as its factorization.

28726469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44250.

The product of its digits is 290304, while the sum is 44.

The square root of 28726469 is about 5359.7079211464. The cubic root of 28726469 is about 306.2626825790.

The spelling of 28726469 in words is "twenty-eight million, seven hundred twenty-six thousand, four hundred sixty-nine".