87278420 has 18 divisors (see below), whose sum is σ = 183372462. Its totient is φ = 34894656.

The previous prime is 87278413. The next prime is 87278447. The reversal of 87278420 is 2487278.

It can be written as a sum of positive squares in 3 ways, for example, as 41011216 + 46267204 = 6404^2 + 6802^2 .

It is a congruent number.

It is an unprimeable number.

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 in 5 ways as a sum of consecutive naturals, for example, 40736 + ... + 42824.

It is an arithmetic number, because the mean of its divisors is an integer number (10187359).

Almost surely, 2^87278420 is an apocalyptic number.

It is an amenable number.

87278420 is an abundant number, since it is smaller than the sum of its proper divisors (96094042).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

87278420 is an equidigital number, since it uses as much as digits as its factorization.

87278420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4187 (or 2096 counting only the distinct ones).

The product of its (nonzero) digits is 50176, while the sum is 38.

The square root of 87278420 is about 9342.2920099941. The cubic root of 87278420 is about 443.5769378708.

The spelling of 87278420 in words is "eighty-seven million, two hundred seventy-eight thousand, four hundred twenty".