87725857 has 2 divisors, whose sum is σ = 87725858. Its totient is φ = 87725856.

The previous prime is 87725851. The next prime is 87725867. The reversal of 87725857 is 75852778.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71757841 + 15968016 = 8471^2 + 3996^2 .

It is a cyclic number.

It is not a de Polignac number, because 87725857 - 2³ = 87725849 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 87725857.

It is not a weakly prime, because it can be changed into another prime (87725851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43862928 + 43862929.

It is an arithmetic number, because the mean of its divisors is an integer number (43862929).

Almost surely, 2^87725857 is an apocalyptic number.

It is an amenable number.

87725857 is a deficient number, since it is larger than the sum of its proper divisors (1).

87725857 is an equidigital number, since it uses as much as digits as its factorization.

87725857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1097600, while the sum is 49.

The square root of 87725857 is about 9366.2082509413. The cubic root of 87725857 is about 444.3336523676. Note that the first 3 decimals are identical.

The spelling of 87725857 in words is "eighty-seven million, seven hundred twenty-five thousand, eight hundred fifty-seven".