28715437 has 2 divisors, whose sum is σ = 28715438. Its totient is φ = 28715436.

The previous prime is 28715419. The next prime is 28715471. The reversal of 28715437 is 73451782.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21473956 + 7241481 = 4634^2 + 2691^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28715437 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28715396 and 28715405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28715417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14357718 + 14357719.

It is an arithmetic number, because the mean of its divisors is an integer number (14357719).

Almost surely, 2^28715437 is an apocalyptic number.

It is an amenable number.

28715437 is a deficient number, since it is larger than the sum of its proper divisors (1).

28715437 is an equidigital number, since it uses as much as digits as its factorization.

28715437 is an evil number, because the sum of its binary digits is even.

The product of its digits is 47040, while the sum is 37.

The square root of 28715437 is about 5358.6786617598. The cubic root of 28715437 is about 306.2234722545.

The spelling of 28715437 in words is "twenty-eight million, seven hundred fifteen thousand, four hundred thirty-seven".