87445777 has 2 divisors, whose sum is σ = 87445778. Its totient is φ = 87445776.

The previous prime is 87445769. The next prime is 87445781. The reversal of 87445777 is 77754478.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83247376 + 4198401 = 9124^2 + 2049^2 .

It is a cyclic number.

It is not a de Polignac number, because 87445777 - 2³ = 87445769 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 87445777.

It is not a weakly prime, because it can be changed into another prime (87445717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43722888 + 43722889.

It is an arithmetic number, because the mean of its divisors is an integer number (43722889).

Almost surely, 2^87445777 is an apocalyptic number.

It is an amenable number.

87445777 is a deficient number, since it is larger than the sum of its proper divisors (1).

87445777 is an equidigital number, since it uses as much as digits as its factorization.

87445777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1536640, while the sum is 49.

The square root of 87445777 is about 9351.2446765123. The cubic root of 87445777 is about 443.8602775054.

The spelling of 87445777 in words is "eighty-seven million, four hundred forty-five thousand, seven hundred seventy-seven".