28680437 has 2 divisors, whose sum is σ = 28680438. Its totient is φ = 28680436.

The previous prime is 28680433. The next prime is 28680461. The reversal of 28680437 is 73408682.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22335076 + 6345361 = 4726^2 + 2519^2 .

It is a cyclic number.

It is not a de Polignac number, because 28680437 - 2² = 28680433 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28680437.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28680433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14340218 + 14340219.

It is an arithmetic number, because the mean of its divisors is an integer number (14340219).

Almost surely, 2^28680437 is an apocalyptic number.

It is an amenable number.

28680437 is a deficient number, since it is larger than the sum of its proper divisors (1).

28680437 is an equidigital number, since it uses as much as digits as its factorization.

28680437 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64512, while the sum is 38.

The square root of 28680437 is about 5355.4119356031. The cubic root of 28680437 is about 306.0990075055.

The spelling of 28680437 in words is "twenty-eight million, six hundred eighty thousand, four hundred thirty-seven".