90785777 has 2 divisors, whose sum is σ = 90785778. Its totient is φ = 90785776.

The previous prime is 90785741. The next prime is 90785803. The reversal of 90785777 is 77758709.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83978896 + 6806881 = 9164^2 + 2609^2 .

It is a cyclic number.

It is not a de Polignac number, because 90785777 - 2¹⁰ = 90784753 is a prime.

It is not a weakly prime, because it can be changed into another prime (90785377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45392888 + 45392889.

It is an arithmetic number, because the mean of its divisors is an integer number (45392889).

Almost surely, 2^90785777 is an apocalyptic number.

It is an amenable number.

90785777 is a deficient number, since it is larger than the sum of its proper divisors (1).

90785777 is an equidigital number, since it uses as much as digits as its factorization.

90785777 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864360, while the sum is 50.

The square root of 90785777 is about 9528.1570620976. The cubic root of 90785777 is about 449.4409139020.

The spelling of 90785777 in words is "ninety million, seven hundred eighty-five thousand, seven hundred seventy-seven".