87478273 has 2 divisors, whose sum is σ = 87478274. Its totient is φ = 87478272.

The previous prime is 87478253. The next prime is 87478291. The reversal of 87478273 is 37287478.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87291649 + 186624 = 9343^2 + 432^2 .

It is a cyclic number.

It is not a de Polignac number, because 87478273 - 2⁵ = 87478241 is a prime.

It is not a weakly prime, because it can be changed into another prime (87478253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43739136 + 43739137.

It is an arithmetic number, because the mean of its divisors is an integer number (43739137).

Almost surely, 2^87478273 is an apocalyptic number.

It is an amenable number.

87478273 is a deficient number, since it is larger than the sum of its proper divisors (1).

87478273 is an equidigital number, since it uses as much as digits as its factorization.

87478273 is an evil number, because the sum of its binary digits is even.

The product of its digits is 526848, while the sum is 46.

The square root of 87478273 is about 9352.9820378316. The cubic root of 87478273 is about 443.9152521338.

It can be divided in two parts, 8747 and 8273, that added together give a triangular number (17020 = T₁₈₄).

The spelling of 87478273 in words is "eighty-seven million, four hundred seventy-eight thousand, two hundred seventy-three".