28728967 has 2 divisors, whose sum is σ = 28728968. Its totient is φ = 28728966.

The previous prime is 28728949. The next prime is 28728989. The reversal of 28728967 is 76982782.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28728967 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28728967.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28768967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14364483 + 14364484.

It is an arithmetic number, because the mean of its divisors is an integer number (14364484).

Almost surely, 2^28728967 is an apocalyptic number.

28728967 is a deficient number, since it is larger than the sum of its proper divisors (1).

28728967 is an equidigital number, since it uses as much as digits as its factorization.

28728967 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 677376, while the sum is 49.

The square root of 28728967 is about 5359.9409511673. The cubic root of 28728967 is about 306.2715596650.

The spelling of 28728967 in words is "twenty-eight million, seven hundred twenty-eight thousand, nine hundred sixty-seven".