28737469 has 4 divisors (see below), whose sum is σ = 28829596. Its totient is φ = 28645344.

The previous prime is 28737451. The next prime is 28737479. The reversal of 28737469 is 96473782.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 96473782 = 2 ⋅48236891.

It can be written as a sum of positive squares in 2 ways, for example, as 15327225 + 13410244 = 3915^2 + 3662^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28737469 is a prime.

It is a super-2 number, since 2×28737469² = 1651684249051922, 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 (28737479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45594 + ... + 46219.

It is an arithmetic number, because the mean of its divisors is an integer number (7207399).

Almost surely, 2^28737469 is an apocalyptic number.

It is an amenable number.

28737469 is a deficient number, since it is larger than the sum of its proper divisors (92127).

28737469 is an equidigital number, since it uses as much as digits as its factorization.

28737469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92126.

The product of its digits is 508032, while the sum is 46.

The square root of 28737469 is about 5360.7339982506. The cubic root of 28737469 is about 306.3017691742.

The spelling of 28737469 in words is "twenty-eight million, seven hundred thirty-seven thousand, four hundred sixty-nine".