28690777 has 2 divisors, whose sum is σ = 28690778. Its totient is φ = 28690776.

The previous prime is 28690763. The next prime is 28690789. The reversal of 28690777 is 77709682.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26512201 + 2178576 = 5149^2 + 1476^2 .

It is a cyclic number.

It is not a de Polignac number, because 28690777 - 2¹¹ = 28688729 is a prime.

It is not a weakly prime, because it can be changed into another prime (28690477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14345388 + 14345389.

It is an arithmetic number, because the mean of its divisors is an integer number (14345389).

Almost surely, 2^28690777 is an apocalyptic number.

It is an amenable number.

28690777 is a deficient number, since it is larger than the sum of its proper divisors (1).

28690777 is an equidigital number, since it uses as much as digits as its factorization.

28690777 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 296352, while the sum is 46.

The square root of 28690777 is about 5356.3772271938. The cubic root of 28690777 is about 306.1357884821.

The spelling of 28690777 in words is "twenty-eight million, six hundred ninety thousand, seven hundred seventy-seven".