28712969 has 2 divisors, whose sum is σ = 28712970. Its totient is φ = 28712968.

The previous prime is 28712963. The next prime is 28712977. The reversal of 28712969 is 96921782.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27175369 + 1537600 = 5213^2 + 1240^2 .

It is a cyclic number.

It is not a de Polignac number, because 28712969 - 2⁴ = 28712953 is a prime.

It is a super-2 number, since 2×28712969² = 1648869177589922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28712963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14356484 + 14356485.

It is an arithmetic number, because the mean of its divisors is an integer number (14356485).

Almost surely, 2^28712969 is an apocalyptic number.

It is an amenable number.

28712969 is a deficient number, since it is larger than the sum of its proper divisors (1).

28712969 is an equidigital number, since it uses as much as digits as its factorization.

28712969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 44.

The square root of 28712969 is about 5358.4483761626. The cubic root of 28712969 is about 306.2146990270.

The spelling of 28712969 in words is "twenty-eight million, seven hundred twelve thousand, nine hundred sixty-nine".