87218478 has 16 divisors (see below), whose sum is σ = 193818960. Its totient is φ = 29072808.

The previous prime is 87218477. The next prime is 87218479. The reversal of 87218478 is 87481278.

It is an interprime number because it is at equal distance from previous prime (87218477) and next prime (87218479).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87218473) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 807525 + ... + 807632.

It is an arithmetic number, because the mean of its divisors is an integer number (12113685).

Almost surely, 2^87218478 is an apocalyptic number.

87218478 is an abundant number, since it is smaller than the sum of its proper divisors (106600482).

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

87218478 is a wasteful number, since it uses less digits than its factorization.

87218478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1615168 (or 1615162 counting only the distinct ones).

The product of its digits is 200704, while the sum is 45.

The square root of 87218478 is about 9339.0833597308. The cubic root of 87218478 is about 443.4753664547.

The spelling of 87218478 in words is "eighty-seven million, two hundred eighteen thousand, four hundred seventy-eight".