28040437 has 2 divisors, whose sum is σ = 28040438. Its totient is φ = 28040436.

The previous prime is 28040431. The next prime is 28040443. The reversal of 28040437 is 73404082.

It is a balanced prime because it is at equal distance from previous prime (28040431) and next prime (28040443).

It can be written as a sum of positive squares in only one way, i.e., 22982436 + 5058001 = 4794^2 + 2249^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28040437 is a prime.

It is a super-2 number, since 2×28040437² = 1572532214301938, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28040431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14020218 + 14020219.

It is an arithmetic number, because the mean of its divisors is an integer number (14020219).

Almost surely, 2^28040437 is an apocalyptic number.

It is an amenable number.

28040437 is a deficient number, since it is larger than the sum of its proper divisors (1).

28040437 is an equidigital number, since it uses as much as digits as its factorization.

28040437 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 28040437 is about 5295.3221809442. The cubic root of 28040437 is about 303.8050060985.

The spelling of 28040437 in words is "twenty-eight million, forty thousand, four hundred thirty-seven".