28772069 has 2 divisors, whose sum is σ = 28772070. Its totient is φ = 28772068.

The previous prime is 28772063. The next prime is 28772077. The reversal of 28772069 is 96027782.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28751044 + 21025 = 5362^2 + 145^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28772069 is a prime.

It is a super-2 number, since 2×28772069² = 1655663909081522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28772063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14386034 + 14386035.

It is an arithmetic number, because the mean of its divisors is an integer number (14386035).

Almost surely, 2^28772069 is an apocalyptic number.

It is an amenable number.

28772069 is a deficient number, since it is larger than the sum of its proper divisors (1).

28772069 is an equidigital number, since it uses as much as digits as its factorization.

28772069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 28772069 is about 5363.9601974660. The cubic root of 28772069 is about 306.4246492917.

The spelling of 28772069 in words is "twenty-eight million, seven hundred seventy-two thousand, sixty-nine".