87478057 has 2 divisors, whose sum is σ = 87478058. Its totient is φ = 87478056.

The previous prime is 87478021. The next prime is 87478103. The reversal of 87478057 is 75087478.

It is an a-pointer prime, because the next prime (87478103) can be obtained adding 87478057 to its sum of digits (46).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59768361 + 27709696 = 7731^2 + 5264^2 .

It is a cyclic number.

It is not a de Polignac number, because 87478057 - 2¹¹ = 87476009 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 87477998 and 87478016.

It is not a weakly prime, because it can be changed into another prime (87478357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43739028 + 43739029.

It is an arithmetic number, because the mean of its divisors is an integer number (43739029).

Almost surely, 2^87478057 is an apocalyptic number.

It is an amenable number.

87478057 is a deficient number, since it is larger than the sum of its proper divisors (1).

87478057 is an equidigital number, since it uses as much as digits as its factorization.

87478057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 439040, while the sum is 46.

The square root of 87478057 is about 9352.9704907051. The cubic root of 87478057 is about 443.9148867639.

The spelling of 87478057 in words is "eighty-seven million, four hundred seventy-eight thousand, fifty-seven".