28757777 has 2 divisors, whose sum is σ = 28757778. Its totient is φ = 28757776.

The previous prime is 28757741. The next prime is 28757809. The reversal of 28757777 is 77775782.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21446161 + 7311616 = 4631^2 + 2704^2 .

It is a cyclic number.

It is not a de Polignac number, because 28757777 - 2⁶ = 28757713 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28757077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14378888 + 14378889.

It is an arithmetic number, because the mean of its divisors is an integer number (14378889).

Almost surely, 2^28757777 is an apocalyptic number.

It is an amenable number.

28757777 is a deficient number, since it is larger than the sum of its proper divisors (1).

28757777 is an equidigital number, since it uses as much as digits as its factorization.

28757777 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1344560, while the sum is 50.

The square root of 28757777 is about 5362.6278073348. The cubic root of 28757777 is about 306.3739039383.

The spelling of 28757777 in words is "twenty-eight million, seven hundred fifty-seven thousand, seven hundred seventy-seven".