87723257 has 2 divisors, whose sum is σ = 87723258. Its totient is φ = 87723256.

The previous prime is 87723239. The next prime is 87723287. The reversal of 87723257 is 75232778.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81072016 + 6651241 = 9004^2 + 2579^2 .

It is a cyclic number.

It is not a de Polignac number, because 87723257 - 2¹⁰ = 87722233 is a prime.

It is not a weakly prime, because it can be changed into another prime (87723217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43861628 + 43861629.

It is an arithmetic number, because the mean of its divisors is an integer number (43861629).

Almost surely, 2^87723257 is an apocalyptic number.

It is an amenable number.

87723257 is a deficient number, since it is larger than the sum of its proper divisors (1).

87723257 is an equidigital number, since it uses as much as digits as its factorization.

87723257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 164640, while the sum is 41.

The square root of 87723257 is about 9366.0694530844. The cubic root of 87723257 is about 444.3292626360.

The spelling of 87723257 in words is "eighty-seven million, seven hundred twenty-three thousand, two hundred fifty-seven".