28728607 has 2 divisors, whose sum is σ = 28728608. Its totient is φ = 28728606.

The previous prime is 28728593. The next prime is 28728631. The reversal of 28728607 is 70682782.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28728607 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28728607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28728677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14364303 + 14364304.

It is an arithmetic number, because the mean of its divisors is an integer number (14364304).

Almost surely, 2^28728607 is an apocalyptic number.

28728607 is a deficient number, since it is larger than the sum of its proper divisors (1).

28728607 is an equidigital number, since it uses as much as digits as its factorization.

28728607 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 75264, while the sum is 40.

The square root of 28728607 is about 5359.9073686026. The cubic root of 28728607 is about 306.2702803729.

The spelling of 28728607 in words is "twenty-eight million, seven hundred twenty-eight thousand, six hundred seven".