28304077 has 2 divisors, whose sum is σ = 28304078. Its totient is φ = 28304076.

The previous prime is 28304057. The next prime is 28304113. The reversal of 28304077 is 77040382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28079401 + 224676 = 5299^2 + 474^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28304077 is a prime.

It is a super-2 number, since 2×28304077² = 1602241549643858, which contains 22 as substring.

It is equal to p_1759216 and since 28304077 and 1759216 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28304057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14152038 + 14152039.

It is an arithmetic number, because the mean of its divisors is an integer number (14152039).

Almost surely, 2^28304077 is an apocalyptic number.

It is an amenable number.

28304077 is a deficient number, since it is larger than the sum of its proper divisors (1).

28304077 is an equidigital number, since it uses as much as digits as its factorization.

28304077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9408, while the sum is 31.

The square root of 28304077 is about 5320.1576104473. The cubic root of 28304077 is about 304.7541761964.

The spelling of 28304077 in words is "twenty-eight million, three hundred four thousand, seventy-seven".