87744257 has 2 divisors, whose sum is σ = 87744258. Its totient is φ = 87744256.

The previous prime is 87744211. The next prime is 87744277. The reversal of 87744257 is 75244778.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85673536 + 2070721 = 9256^2 + 1439^2 .

It is a cyclic number.

It is not a de Polignac number, because 87744257 - 2¹⁰ = 87743233 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (87744277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43872128 + 43872129.

It is an arithmetic number, because the mean of its divisors is an integer number (43872129).

Almost surely, 2^87744257 is an apocalyptic number.

It is an amenable number.

87744257 is a deficient number, since it is larger than the sum of its proper divisors (1).

87744257 is an equidigital number, since it uses as much as digits as its factorization.

87744257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 439040, while the sum is 44.

The square root of 87744257 is about 9367.1904539195. The cubic root of 87744257 is about 444.3647156821.

It can be divided in two parts, 8774 and 4257, that added together give a palindrome (13031).

The spelling of 87744257 in words is "eighty-seven million, seven hundred forty-four thousand, two hundred fifty-seven".